I think (but it may not be true), that gear is bad for everyone.
I know Marauder are extra screwed over. The set bonuses for them are the worse ever possible. I think they had a meeting with powerpoint slides to come up with set bonuses this bad.
Marauder has to buy Tank armor they can't use, and pull out the armoring from heavy armor and place it into medium armor. There is no "Buy the Warhero piece, and just add MK-6" for them.
And for all that effort, they can still only use one of the two set bonuses.
Pretty sure though, every class has to heavily remod gear. It's like this by design.