Teams are not very important. Join the one your friends are in if they let you and have fun with them. I'm in [RF] but I don't live and die by them, they're just my MNC friends that I play with most of the time, so it just makes sense to join a team with them in it.
I know you said not to comment on specific teams, but since they're not very competitive to play against anyways, I'd like to say Grand Prize is a decent group of guys.
theres always going to be teams in this game weather its a group of friends or a clan. If you know who rolls with who then you know what to expect. Try viewing peoples friends list and youll catch on... Most people dont play this game solo or if they do its to boost their stats