So what classes are you all playing now and what are your thoughts?
I have a 42 guardian, 34ish engineer and a 16 warrior.
Warrior seems pretty stronk, probably gonna be a good choice for PvP. Damage seems good and can be very tanky. I don't see them being as strong in PvE though because they seem very "every man for himself" which isn't so helpful when everyones taking damage.
Engineer is fun, very versatile. I don't like the weapon skills so much or the kits, but it takes some thought to make sure you have the right skill set going into fights. Very capable of taking down hard targets solo despite being squishy. They also seem like they'll be great in PvE because you can go all out damage or you can be very supporty (either agressively with debuffs for enemies or taking a healing kit).
Guardians seem like they're going to be very strong in PvE because their AoE tanking buffs people so strongly. I did AC yesterday and was surprised how much of a breeze it was (after struggling in there on my engineer) just because I was mace and shield AoE supporting allies, people took very little damage. I also was very tanky individually, tanking one of the lovers bosses solo (while my team took down the other) was a walk in the park. I don't know how strong they'll be in PvP yet, I suspect weaker than PvE because there's less times you'll be grouped up and their DPS isn't too strong, but I've not tried a damage build yet, so I might just be underestimating how much damage they can output with the right build or done much PvP at all so might not realise how often there's large team fights (talking proper PvP not WvWvW here).
She also looks a bit like an Ultramarine. 
). Not quite so good for support in groups, and ranged damage is always a nice commodity to have in PvP - allows for easier judgement on when to join the fray or back off.