Really Hemms didn't catch fire as Thor on here until Ragnarok. People largely said Hemms wasn't doing much with the role, and that Thor was not being written in an interesting way mostly. Even in The Avengers, largely the breakout characters were Hulk and Iron Man predominately. Hemms was overshadowed in both Thor and TDW by Loki (beloved since day 1) and in The Avengers no one praised Hemms since Thor got the lowest screen time outside of Hawkeye.
In the case of Evans from The Avengers, everyone liked his performances but largely Cap's characterization didn't catch fire on here until TWS. I say that as someone who has been on board the Cap wagon since day 1.
So again, I'm not rewriting anything. This was the perception.