Here's a post I recently did on paladin's. Copy/pasted. (If there's any communicative oddities)
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I love the paladin, favourite kit by far. The omni-shield gives an interesting additional level of mechanics that most other kits lack. I've played virtually every combination of powers and use a variety of weapons. The 6/6/6/0/6 is good but by no means the be all/end all for him. Weapon damage is still quite useful.
I'm currently using a 6/4/6/4/6 build, but I blow my respecs on this toon (And sentinel iirc has my highest promotions) like candy.
The mechanics of his three powers are so diverse and situationally useful that I'll try to spec into them all. (usually...)
ED is a hitscan, with unlimited range. Quite useful for those extreme range attacks as you wait for enemies to close onto your chosen ground. It cannot be dodged.
Incin is useful for arcing around/over cover, it can be dodged however and the further away, the easier for an enemy to dodge. My current build is designed to use Incin whenever I need that arcing or I want to force an enemy to dodge so I can line up some head shots. I instead use the fire shield for my techsplosions or ED whenever possible.
Snapcheese is snap cheese. It's one of the best powers in the game. It goes through walls and with the distance evolution it can hit quite far away. Duration and Slow can be useful if you work it, but the damage is better in general. I've used the slow to help drag out spawns so I can deal with them one at a time but this is... lets just say the dmg evo is simpler all round. If you have the Geth Scanner it becomes downright silly and eventually boring.
The omni-shield... I love this damn thing. It has multiple uses.
- Your omni-shield coffers a .5 second invulnerability frame when you tap it. This can be used to entirely mitigate banshee warp balls that are thrown at you when you "whack" the ball a split second before it hits you. This can be used in multiple ways. I even experimented with it against brutes. Their charge attack damage can be mitigated using this trick. (Beware the swipe at the end though.)
- when enemies melee your fire/cryo shield they do damage to themselves. An enemy on a health bar attempting to melee your cryo shield will freeze itself and fall over. This is rarely useful but on occassion, hilarious. *whack* slowly freezes *thump* falls over...
- Your heavy melee (Shield plant) does a small aoe for around half the damage of a shield whack. You can "shield plant" then "shield whack" immediately after for quicker damage.
- roll to get out of shield plant quickly.
Your shield protects you from damage in a 45 degree angle in front of you. If used correctly, you can clog up an entire hallway using this. Remember it's only 45 degrees. You can be flanked *very* easily. Pretty much every other player I've ever met has told me how useless this is. I still just laugh at their complete lack of imagination. It means you'll score lower, but when used in conjuction with two other players capable of AoEing (And setting off tech or biotic explosions) it's a wonder to behold. Many many times over the years of playing now I have watched certain savvy PC players catch on and start using this. I'll start working with them. Often Geth Flame Troopers will flame just over my shoulder while I snap freeze/shield plant/snap freeze/shield plant. I had an N7 slayer/Shadow using their biotic/electric Slashes from behind shield. Me and the slayer duo'd a vancouver platinum this way while the other two were on the ground for 90% of the waves.
There are few things in the game (imho) that feel as good as shield planting in front of a corpse while another team member resses your fallen or shielding someone doing a device from a geth prime lobbing siege pulses. (Don't stand too near though, AoEs can still hit off you to others around you.) You're a paladin.
You're human, you have the ability to roll. This is where the fun really begins in cqc. When a banshee is exactly one jump away from you, and just as she starts to jump at you, roll *fowards*. This puts you behind her. This will stop her jumping if done correctly, immediately 180 to face her. She'll still be turning around, use a power on her. (Which depends if she's on barrier or armour and if you need shields.) Then roll forward diagonally around her. Then roll diagonally *behind* her. She'll swipe at where you just were, she'll miss, giving you the opportunity to *WHACK* her in the butt with your shield while she's trapped in her swipe animation. (remember to gtfo after that swipe though.) Banshees are now my favourite thing to kill with my paladin. If done correctly the only ability she has that can do damage to you is her AoE burst, and that's not enough to kill you.
It took me a lot of deaths, and a lot of experiements, and lag is still my number one killer when I'm dancing around like that, but nothing gets me happier than seeing 3 team mates runninig from a banshee while I'm runninig past them, *at* her, then seeing them all stop, and start staring while we dance. (I can tell they're staring because they aren't SHOOTING, they're just watching. I can almost see their jaws dropping.)
Paladins, only other kits that get my adrenaline pumping as much are drell, volus bowlingball. and asari valkyrie specced for hit'n'run.
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Edit to include.
Weapons...
Get a Talon (I know, it's rng.) but really. Talon.
Barring that my favourite weapons thus far are the Harrier if I have weapons passives. You're running around enough that circling by to hit an ammo crate isn't terribly inefficient. But the gem I've been using recently is the Indra. Makes long range a bit more viable while keeping mid range efficient. Short range is for shield thumping.
One thing to consider as well, ammo powers that can be detonated (incinerate ammo namely) only act a level 1 catalyst. Detonating your incendiary ammo can sometimes prove detrimental. If you see a lot of biotics in the pug seriously consider warp. Otherwise AP. I shy from disrupter because any shields I see are valuable on Platinum and must be ED'd immediately for the buff and regen. (Less important on silver in all fairness however.)