I just want ME4 multiplayer to get rid of the bull**** sync kill mechanics. ME3 multiplayer is surprisingly fun and fresh, but it has three major flaws:
1. BioWare doesn't know how to support a multiplayer game. Valve, Activision, etc all do. BioWare's support is abysmal. There are still game-breaking bugs in multiplayer.
2. The store is completely random (gambling) and the end-game aspect of it is such a slog that it's not a compelling reason in-and-of-itself to play. Honestly, the only reason I still play multi is because it's generally fun and I have a number of friends that still do as well. If I wasn't playing with people I know, I would've shelved multi a long time ago.
3. Sync kills are abysmal. Several of them are buggy (Hello, banshee, you were 10 feet away yet you're still picking me up? Hello Phantom, I was actually in the middle of Nova or Charge, but by all means, totally ignore their stunning effects and put a sword through me anyway... oh yes, and Mr. Atlas, I'm thrilled that my shields didn't regen when I charged you, but it's even better that you didn't actually melee before syncing me either), all of them are situational, and simply playing "smart" is not a way to avoid them. An entire class is dedicated to CQC/melee combat, and yet sync kills are entirely predicated on proximity to the enemy (supposedly).
As long as the next Mass Effect installment has SP/MP I'll probably buy it, but if its MP-only, BioWare is going to have to prove they can actually build and support a multiplayer title. I know patching on consoles is expensive, but that's why every other MP publisher maintains separate codebases so they can patch the PC version at their whim, then role out to consoles after they've let them test out on PC.