What're the best options?
Warrior - yeah melee. AI doesn't know how to play melee. No.
Assassin - mostly melee. I can't see any reason to use A/R or A/P instead of Rangers and Paragons. No.
Derv - mostly melee. Some PBAoE nukes, which I don't think the AI knows how to use (never tried though), and besides they're affected by armour. D/P's etc are similarly inferior to P/whatever. Can't see any reason to use them.
Rit - spirit spammers are clearly the best caster damage right now, but you can only have one of each spirit and also only 2 Rits.
Nec - minion bombers deal lots of damage, but you can only run one of them. I don't know about everything else. SS does some damage, but apparently heroes only casts it on targets you're focusing, which greatly decreases its damage output. The rest of the Curses line suffers from low damage, unless via force amplification (MoP, Barbs), which needs something to trigger it in the first place. Death Magic would be great if it had more effective skills for damage, but it doesn't. There's Discord, Rising Bile, Putrid Bile, and ... out of options. A lot of the Death Magic damage skills are affected by armour as well, or aren't AoE. Finally there's Blood, which doesn't really do damage.
Mes - Dom Mes might be able to deal some damage. The damage doesn't come in large packets however (79 damage Spiritual Pain @ 16 spec, which is way inferior to 140-damage Lightning Orb @ 16 spec). Major draw I guess would be that the skills recharge quickly thanks to Fast Casting, and you cast them faster as well. Right now I imagine the best elite is probably Energy Surge.
Ele - Air is probably the best element choice. Something around Invoke Lightning + Chain Lightning + Lightning Orb + Shell Shock, probably.
Monk - don't deal damage. Comparatively little anyway.
Paragon - also don't deal damage, unless it's by proxy (Splinter Weapon from Rits).
Ranger - I don't know about this one, maybe someone with more experience with Rangers in PvE can tell me. Do a few pet attacks + some kind of AoE bow attack deal enough to match the other options? What about other weapon choices? Is it worth dedicating Splinter Weapons and MoP's and Strength of Honours for the pet?
Clearly nothing is going to match the Rits and MMs, but what's the next best option?
EDIT: I mean as a whole - so it's not Rangers competing with other Ranger builds, but Rangers competing with the best that Necros, Mesmers, Eles, etc can do.
J

