Well regarding the classes... I like them decently enough, but I think they could be made more interesting/cool/fun... I haven't thought THAT much about it... it's just random thoughts I've had.
Adept:
I'm thinking we should kinda get the vibe of a jedi throwing stuff and people around using out space magics. Not ripping star wars off... but you know... the feeling of picking people up with your mind and throw them into other people because youre sithemo. Singularity / forcestorm... Mass effect adept is ok, but it lacks a certain oomph or feeling of "power".
Soldier:
Feels kinda hard to spice this one up, since it feels to be about shooting and being good at it, but I think there is a way. Guns, lots of guns... ok maybe not that, but big guns. I'm thinking heavy rifles and machineguns. Not a mech, but your armor and training is all about bringing a big ass gun to bear on the enemy. Your rain of fire should keep the enemy suppressed, staggered and possibly even push them back. Think of that feeling you get as a heavy in tf2, when the enemy picked tiny man scouts only... ratatatatatata...
Engineer:
Also feels a bit underwhelming. I think there should be atleast 2 ways of playing the engineer.
An "elemental mage" of fire, cold and electricity. The way it's currently showed off is a bit boring and possibly "underpowered". Flames from your hands, cold from your hands and "force rage lightning", is the feel to go for.
A gadget engineer... More of a thinking players class. I'm thinking... strategically placed mines (slizing lasers not just explosives?), perfectly setup turrets, defensive barriers or some kind of shield restore... Specializing in possibly explosives but also holding an area. But for the love of god... not those underwhelming "turrets again" ... Look up the turrets from aliens or tf2... Now that's some bad ass turrets. Maybe to go for that feeling of a perfectly executed xcom2 ambush... Leaving you with a cold narrow smile of evil satisfaction.
Vanguard:
The vanguard is the only class I'd say that is currently just badass and fun to play... Definately keep that suicidal charging in and exploding with fury recklessness and high mobility. It's just too damn fun to play... even if it is risky.
Possibly subdivided into a class that charges and melees and one that charges and uses spacemagic nova.
Sentinel: This is the one class I have no input on ... I can't get into it... It needs a niche... Full tanking? Alot of people dislike the geth juggernaught... but if you're feeling like it... there is nothing like getting right in the bosses face and say... whats up? Straight to their face... and the awesomeness of casually shrugging off smaller enemies. How to balance that? I don't know...
Infiltrator:
Can be decently awesome... I love to snipe, but it feels a bit silly to use cloak just to boost damage from afar. Maybe from afar it should just be some sort of concealment (not cloak but enemies are much less likely to target you) and sniper rifle damage.
The other way of playing is offcourse cloak and getting up close... Shotgun style or Melee style. I do love the shadow strike, there's something very matrix like about moving around in a group going stab crazy.
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In any case... I'm not saying that mass effect Andromeda... should loose the, for it's universe, realistic style.
What I'm saying is that I hope they somehow manage to make the classes a bit more "awesome" or bad ass... fun and both visually and emotionally rewarding to play.
That there is more "oomph" in the combat portions... That we walk away with a feeling of "holy c*** that was aweome".
For me the vanguard currently does it best... When you are recklessly throwing yourself from enemy to enemy surving on that sliver of health and I think the other classes deserve some of that, even if it's in different ways.