My views so far after a couple of hours...
At first its hard to get into and I highly recommend doing the training just to get a feel/know the controls.
I also think its important to mess with the settings a bit I inverted my controls and increased the sensitivity slightly found it a bit too slow on default.
When you pick to manually join servers if you press start you can change filters making it easier to join games with no lag
Once I got used to how the game played and tried out all the modes I think the game is great. Being able to play 3rd person or first is great and I think they have done it very well. Also the effects are impressive for instance when you get hit by a rocket launcher or grenade.
Hiding in a box/barrel works well as does playing dead. Once you learn to play dead and learn to add skills such as close quarter you can have lots of fun sneaking up on people and choking them or using them as a human shield as you take out their mates.
Also to do certain things you need to pick the skill (basically perks) which I think applies to using the knife.
EDIT: Useless but it made me lol, on character selection I was just spinning my guy around for a bit and when I went to enter instead of saluting he fell over
