Here's a short list of things that IMO should be a priority:
EA & Origin should be excluded, ofc better servers and game support, off host issues brought to a minimum, BROKEN POWERS and that sort of glitches may be an unavoidable factor but it shouldn't take devs 2 years or "end of support" to fix it.
Ops packs, and gel failing for 5 times in a row could also use a tune up.
Weapons…are a slippery slope to discuss, however I think they should be better balanced. Sure let us have the big guns, small guns, guns that stagger, guns that hit harder than others, but I wish all guns were viable an all difficulties. (Please refer this last comment as the "slippery slope" statement)
Ahem..stunlock..maybe a little break there (though we are far worse than any enemy for that matter). But you have to admit we adapted pretty well to bear with that BS. What troubles me more is ravagers, primes, RTs, phantoms, scions, and the boss himself prime drones sniping you across Rio with 0,01 LoS or through walls and around them.
RNG>>>paying an annual or a monthly fee to play the game IMHO. However, the store can use an overhaul.
The packs should be categorized better, and we should be able to buy the equipment we want (at least the consumables) or in lobby trade system.
There are tons of stuff there that should be changed, but theese are a few general MP stuff I think should be considered for the future. In the end we don't know what will the new ME be about so the discussion is being kept in the boundaries of ME3MP when we talk about the factions. I have stated many times in such discussions that I'm not fighting the Krogans, Batarians or the Turians for that matter should the new title have anything to do with our past problems with those council races.
I would like to see N7 characters in the new MP (not only the existing ones but also some that would make us call the old ones vanilla N7s)
We sure could use a better chat solution though I sympathise the use of mics.
Keep PvP out of the game for the LoG, and alow us the ability to make custom kits (so much detail here with good solutions and ideas described in depth in other simmilar threads).
I'm getting blisters so if I forgot a few things it's because I'm in pain