Like Tryndamere in LoL, it really depends on who's playing him. If played well he is the most broken champ in the game.
I'm not saying Marauder is the strongest character in this game, but they're not the weakest.
(that being said I still want a small buff, lol)
I posted a montage on Marauders ( my second one actually ) Tell me what you guys think.
http://www.youtube.com/watch?feature=player_embedded&v=MwxjW3manvk