Sentinels are GREAT dps in pvp and they can dip out with their cool downs when things get hairy .. but thats almost all they have aside from transcendence (the group speed boost, inspiration doesn't really do much in pvp.) Guardians have the best utility between all the jedi when it comes to pvp imo. They can take a bit more of a beating as dps thanks to the heavy armor, have that huge focus aoe for dps and awe (the group aoe) is amazing when trying to defuse doors / capture things etc. Guardian leap is the single best skill aside from sage pull in huttball. I wear a shield during huttball so if I get the ball I can swap stances on the run and give myself a little more survivability, leap to an enemy, leap to a teammate then leap to another enemy (get the ball from our endzone to enemies in 10 seconds xD.) Shadows are awesome at dps and tanking plus stealth makes them a great asset when needed to guard things, they can stealth cc and wait for help to arrive if they're alone on a turret. Sages are awesome group healers but get focused down pretty fast. Stick to a DPS hybrid sage as they can tear people apart with dots and TK throw. I run both a 50 sage and guardian and usually top the damage charts (focus aoe is awesome and again, sage's eat people up.) TL:DR Sage for ranged dps / heals (you can spot heal in a pinch too) Guardian for tanky dps and awesome versatility Shadows for stealth and cc's galore Sent's for highest dps (if done correctly) - but that's all they can do