Granted, my Mar is significantly higher level than recommended when I do my class missions ( cause I've chronic must-do-evey-single-side-mission OCD ), but at level 27, just having reached the end of Nar Shadda, I have no problem soloing through the class missions. The only time I die during class missions are when I'm being careless (forgetting my buffs, not waching my health, aggroing multiple groups at once etc.). That said though, a Marauder should have no problem soloing through one's class missions provided the specs are solid and the player is capable. Whether the class is underpowered compared to the others I truly cannot say, I haven't had enough experiance with them to form an opinion, but if they truly are underpowered then I'm sure it'll be fixed with later patches. This MMO is brand new afterall, and balacing classes is a thing even veteran MMOs are constantly adjusting. P. S. I'm putting my points into the Rage skilltree if that tells you anything.