Raise or fold?

[Duke]

Bring in: 3c

limps by 6d, Ts

Your hand: Ac (5s 7h)

None of the cards are dead.

I guess the question is, IS there a situation where a raise or limp would be correct?

I say that if the opponents are loose/passive then you can play it a lot of the time.

The counter argument is that you should fold that cheese at all times.

Note: I'm not a stud player, and the guy saying FOLD plays only ultra-high games anymore (though he IS a stud player), so I was looking for the opinion of people who play mid-limit games I may find myself in (15-30 through maybe 100-200).

I suppose this would also have to do with the ante structure, unless my head is solidly in my ass about considering a play at all.

Thanks for any comments.

~Duke