I've been playing dbo for some time now, but I still haven't figured out what Majins are good for. So I was wondering if anyone could tell me what they excel in and what the difference in masterclasses is I would be very grateful.

Thanks in advance!

Large ("Mighty") Majin are good for tanking, the other class is good for dealing damage as well as PvP if you have the right build.

Karma is good in pvp, ultimate is good in pve, tmqs, dungeons etc like grand ma(i prefer grand ma) and plasma is the black cat, sux in all xD

Bull**** !!! Plasma isn't a bad class - with correct build, it can be very good in both pve and pvp (by pvp i mean against all other classes except Fighter/Swordmaster crap).

Agreed, Plasma is good. Can be good at pvp if played right.

Mighty Majin- Physical AoE Dps with tanking capabilities.
Grand Chef-???
Ultimate-??

Wonder Majin- Caster AoE Dps with play dead, the best skill ever :D
Plasma Majin-?
Karma Majin-?

Grand Chef- Spinner + buffer, good build and gear = kill a lot of monsters at once
Ultimate- Spinner + buffer, good build and gear = kill a lot of monsters at once
These two above just got some different buffing skills and different sub webs and you can choose whether or not you look food on your back or a flute :p.

Plasma Majin- More towards AoE; can be really good if you got a good build.
Karma Majin- More leaning towards PvP (but can still be a bit PvE), their single target damage can be outstanding if you have a good build.