Prots are an extremely hard class to kill thanks to high HP, great defence (highest of all classes, they are the tank class) and 3 heals over time skills but they have the lowest dmg. So yes, you could solo lots of bosses but it will take ages. On JS bosses forget about it, those are raid bosses and it takes 15 ppl to kill them. Those can crit 6k dmg on a prot (and they do it quite often). Mobs, yes, you can solo them, 1 at the time (to pull more on a prot its just pointless), but most classes can XD
Comanders are the PvP tanks. They have a lot better dmg but less defence and less chance to block and no heals. So you cant really solo a boss on him unless you use lots of HP pots (including item mall or events)
Tempests are mages with good aoe power. They can actually solo quite well thanks to self heals. I know some tempests that soloed DS bosses. Ive seen some good geared tempys actually solo JS killing all room toguther alone. Only 2 mages i know for sure that can do that are tempests and mystics (not telling its easy, just it can be done).
TBH for starter i would chose tempest or mystic, they dont rely that heavy on gears like prots or comies and aoe mages grind faster and find partys easyer and both have good solo ability (specially mystics i would say).
Edited by Dess, 16 June 2011 - 08:47 AM.