>>1217030781) Audiences had already seen Iron Man 1 & 2, which they liked enough to get excited for the MCU but not another superhero Cinematic Universe with this guy as Tony Stark and Amanda Waller as Nick Fury.
2) Ryan Reynolds was miscast.
3) They established that if the Yellow Fear Spirit touches Earth , the Good Guys lose. Then the yellow CGI touches Earth and the Good Guys still win. So it was confusing and had no stakes (the best that can be said is that it came out before Thor 2, which was the same movie minus the origin parts.)