You played for 8 whole hours? Wow, I can see how you clearly understand all the intricacies of the game balance. There can't possibly be any subtle nuances to game play that will be discovered. No new tips, tricks, or tactics to be discovered at all. 8 hours is enough to completely master a game, and make broad sweeping claims about how competitive it is.
You say you used to be a pro-gamer. You should see just how absurd the above is then. That is precisely what you are claiming. I won't comment on whether it plays like Halo, or is better or worse. However, the claim that you could possibly know how well balanced the game is right now is quite obviously absurd.