1) Idris Elba
It might seem somewhat ridiculous to claim that an actor who has appeared in no less than three (soon to be four) movies in the Marvel Cinematic Universe has been wasted by the studio, but – if we’re being honest – Idris Elba is far too good for the minor role of Heimdall.
The gatekeeper of the Bifrost, Heimdall’s role in the films is an important one but, in terms of personality and story arcs, the character is rather limited. We know from The Wire, Luther and everything else on Elba’s resume that he can reliably deliver the goods, so it is a shame that Marvel are content to let him simply stand around with contact lenses and a silly helmet.
It seems that Elba himself isn’t even too keen on his Marvel role either, as the actor has previously described the process of working on the Thor movies as “torture” (or at least the gruelling reshoots). When even the actor is not enjoying it, it’s safe to say they are not in the right role.