Now that I played a lot of MP, it's fair to say I don't really like it.
There is no option to see or specify faction balancing in the search which bugs me a lot.
Quick join totally ignores everything (obviously intentional but unfortunately inconvenient since you end up playing non tdm modes in small maps with 32 player). Game doesn't hesitate to drop you in a 4-0 match, which is even worse than CoD4/CoD5's matchmaking.
Also apparently there was a patch before I got the game which removed stat padding with bots, yet you can still do stat padding with friends. Seriously why people don't get custom matches with ranking is a stupid idea, I honestly don't know.
I also hate the class system. Medics and Tacticians start with assault rifles which is a torture by itself. Medic may even be unnecessary for matches with good tacticians or good squad leaders since you don't get to restock if you don't respawn. Even if you have extra supply stocks fixed, class ability timers reset after respawning. In a way, game rewards you for getting killed, especially since there are medals that depend on activeness of class ability (for saboteur, scout, assault). And those medals are actually gameplay changing, not simple experience multipliers which are totally useless after some point. You rarely see anyone playing medic in medium sized high rank matches. To be fair, they are useful in assassination defense, which is what, 1 out of 7 objectives.
Tachticians are almost always important but you have to baby sit your spawn points. Their second ability, similar to engineers' primary ability, is not totally useless but the machines they bring not only don't really kill anyone, but can be destroyed easily.
I have to admit I really really like saboteur class and I wish certain other game had that berserk.
Scout is also pretty nice class, unfortunately I don't like sniping at all.
Oh and there is the rocket launcher, cheapest weapon ever. People pick it up and get to high point in a search and destroy game, making plenty cheap kills with only three "bullets". And what's up with asymmetry of search and destroy. In some of the maps, one team has to defend two separate points.
At this point, I doubt I will continue playing much, maybe only for unlocking secondary badge for saboteur, which may be painful without cheating.