I think I want the pets to be rebalanced more than anything (barring glitch fixing). I'm fine with them not distracting boss units, but they need some more utility to counter that nerf.
-Deploying a new decoy or combat drone causes the old one to actually explode and do damage (if that evolution is taken). This would let them have some use on targets who are immune to distraction (stagger or tech detonator). Make their cooldowns a bit longer to compensate if need be.
-Sentry turret needs some bug fixes primarily, but I'd be down with rockets becoming a tech detonator. Flame thrower needs to have a longer priming window.
-Add a multiplier to pet damage based on the difficulty to avoid OP pets on bronze/silver and UP pets on gold/platinum.
-Geth turret just needs a longer priming window on flamethrower as well.
-Combat drone (player) rocket AI movement speed buff.
For weapons
-Argus can fire subsequent bursts faster.
-Collector assault rifle made same weight as the lancer.
-Suppressor spare ammo increased.
-Carnifex weight nerf reverted.
-Paladin clip size to 4.
-Krysae RoF/re-fire delay buffed. Think this would be ok since it is now effected by shield gate.
-Scimitar spare ammo increased.
-Revenant no longer has speed reduction when firing. Buff damage or defense multipliers a little (~10-15%).
-Fix Harrier recoil. Nerf damage a bit, buff spare ammo by 20.
-Nerf reegar. Posts above me have some good input on that. Should wreck shields, not armor (factoring in ammo powers).
-Assault rifles given some innate defense bonus vs armor if they don't already. Probably barring the PPR.
-Typhoon spare ammo buff so I can yell out Salvador quotes for longer.
Other
-Warp given an AoE evolution if the incendiary bug is fixed.
-Buff carnage base force and armor multiplier.
-Slayer given Shadow's melee tree. Phase disruptor buff reverted.
-All krogan get some minor health regen by default. Like 50 per second or so (base value of bloodlust).
-Cryo effects freeze health targets instantly
-Juggy heavy melee shield restore nerfed a bit.
-Phoenix kits given 10% more movement speed. Base shields up to 625.
-Quarksman given same HP as other male quarians.
-Geth bombers cost more of the wave budget.
-Biotic orbs and seeker swarms (player) damage buffed.
-Enemies on screen buffed to either 10 or 12 considering a remastered version of this won't be on PS3/360.
Stim packs and repair matrix would probably need a redesign. I'd say make repair matrix a toggle power like fortification with separate bonuses when activated and purged. Obviously it would become a cooldown power instead of consuming grenades.
-Repair matrix gives movement speed when activated, and a few seconds of shield regen when purged. No auto-revive on either function.
-Stims remain a grenade power, but give a set number of shields per second for a few seconds like repair matrix instead of one big boost. Spamming them would not stack, and this would be handy to preemptively use on the havoc before using havoc strike.