Does Ragnarok need stronger design choices to make it a success?
While Thor 2 wasn't as well-received critically as some of the other Marvel films, it was by no measure a failure. It made millions of dollars for the studio, and while the story might have been overshadowed by some of the other Phase 2 films, there were a few strong moments that made it entertaining (if not an overwhelming favorite). Barring any extreme PR issues or financial meltdowns, there's no reason to think the follow-up will tank. The momentum from the other films alone should guarantee moderate (by Marvel standards) success.
Today Forbes is asserting that director Guillermo del Toro would be a great fit for the final film in the Thor trilogy.
Yeah, the guy responsible for THAT nightmare fuel.
Ragnarok is a really epic story arc in the comics, and there's a lot they can do with it. We've seen a bit of Asguard and the other realms, but they didn't leave a very strong impression. Del Toro's skill as a designer (and the audience pull his name has) could potentially elevate Thor 3. Instead of being 'just another Marvel movie', it could become THE Phase 3 film.
Plus, we'd be 10x more likely to see Loki turn into a horse.