From the 1 - 2 hours I've played so far, I'll just give the cons.
(MAJOR)
- Bots seem to be dimwitted at times.
- Not many strategic elevated positions to jump to as a light body type (Brink videos made it seem like there were). You're mainly just fast on the ground like TF2 scout with the ability to jump off walls.
- Non-existant interactive tutorial. All ya get is an optional video to watch at the start which dumps everything on you in one go and a help guide accessed through the main menu.
- Crashed twice.
- Played online with only one other person and the icon displaying my connection was green, yet the game was still a bit stuttery. I'd hate to see a full match.
- The classes are very similar to TF2. Medics heal, engineers construct sentry guns, and operatives (TF2 spy) can disguise. The Brink soldier just feels like a generic fighter with no significant game changing abilities. With only 3 classes that play slightly differently, it doesn't come near TF2's feeling of class variety and just feels subpar.
(MINOR)
- Screen tears on the cinematic scenes.
- Gun sounds aren't very impressive.
- Grenades explode with a very small explosion effect which make them feel pathetic.
- The cinematic cutscenes before each mission are a waste because they don't add any depth to the story or fictional world and characters don't reveal much about themselves at all. It's usually just a short conversation about the mission you're about to play. It's more of a novelty and you probably won't watch it more than once. The skip button will then be your friend.