It's actually pretty expected to see high profile talent in these movies these days once the overall quality of both the product & the scripts/direction improved beyond Ghost Rider/FF/Daredevil levels of the mid-00's. They're the biggest $$ makers Hollywood is producing & they're generally critically well-received. So by jumping on with one of these movies, they get the profile rise that comes from both the critical praise that these movies have been getting AS WELL AS being able to say that they starred in the biggest money making movie of the year. At that point, they can parlay the critical & financial success of the movie that they were in into the Oscar-bait movie they want & bank on their high-profile from being in that critically lauded, giant money making 'splosion-fest movie about the guy that can shrink & punch people really hard.