I only play support. Not using a mortar yet, but I do piss off people with claymores

But seriously, Support got all the good stuff in comparison to BF2. It has the claymores like Snipers, C4 like Spec ops, bug machine guns that are even more OP with IR sight and a mortar which I have only seen as an engineer weapon in AIX mod for BF2.
Haven't really tried any other class yet, but not really in a hurry, I think I found my favourite one.