Where theropods rippling with muscle?

Theres really no way to tell.

I guess do....

Raptors were slender and fast. They probably had large leg muscles for moving quickly, but overall, they were pretty light and slender.

The most muscular theropods were certainly the tyrannosaurs. Take a look at these pics I found relating to tyrannosaur muscle...

So, yeah, the tyrannosaurs were certainly "rippling" with muscle. Other big theropods were probably quite muscular, but not to the degree tyrannosaurs were.

These clips from Clash of the Dinosaurs do a fantastic job of hilighting the power and musclulature of Tyrannosaurus rex(along with talking about a number of other things about T.rex)...

I'm with Rex Fan on this one, Tyrannosaurs were very heavily muscled compared to other groups. 

Some carcharodontosaurs were also pretty heavily muscled. Tyrannotitan and Acrcanthosaurus for example. Those 2 were among the most robust carcharodontosaurs. 

The carcharadontosarids in the Giganotosaurinae subgroup were the most robust and heavily muscled. Tyrannotitian and Gianotosaurus are the only two Carcharadontosauridea in that family.