It all depends on how *hardcore* a player you are. The *Mystery Box* nature of the microtransactions for ME3's multiplayer totally crosses the line, if you are a *hardcore* enough player. My N7 level is over 1000. I really like its coop gameplay, it's great. There's a big problem with it however. The unlock system is set-up in a way, that the more I played the game, the less rewarding it became - which is not gamedesign I expect to find in a game I paid 90$ for. *Mystery Boxes* belong in free 2 play games (and even in the realm of F2P games, Mystery Boxes are bottom-of-the-barrel design), and I'd argue, regardless of how EA has given out free multiplayer DLC, that Mass Effect 3 does not qualitfy as such.
To repeat myself: "ME3's Mystery Boxes get less rewarding the more you play (or pay)". At the pace I was unlocking ultra rare guns, I'd have had to spend more than 25,000 $ (or about a year of actual playtime) to get to play with the guns I wanted to play with the most. It's the most disgusting experience I had in gaming to date, and it's the main reason why I hate Mass Effect 3 so fucking much. I've quit SW:TOR for similar reasons. Bioware picking up F2P designs like the "Mystery Box" is the worst and most scary trend in gaming to date.
EA has already crossed the line guys. You just don't know it yet, because you aren't *hardcore* enough. Gamebreakingly disgusting things have already taken form, and ruined endgame progression for two Bioware games already, and I only expect it to get worse from here on out. Death to the Mystery Box!