Are we on the PVE server?
Are warriors competitive in PVP?
Warriors are the strongest class and have been since launch (according to a friend). The developers love them.
However, they aren't really overpowered, just a great balance of speed, strength, and fun. They're well designed.
What would people say is the most easiest class to play with?
Medic is pretty easy. Warrior is easy to get your head around, as is Engineer. All are pretty straightforward, with Esper and Spellslinger being maybe the hardest to "master".