➜ is true that Fischer only have weak opponents in chess?

With the caveat that we are only talking about the American portion of his career. His 8 US Championships out of 8 attempts, his perfect 11 out of 11 in the 64 US Championship, his being the youngest winner of the US Championship, you can put a little bit of an asterisk by these accomplishments because US Chess was comparatively weak at the time. Larry Evans was probably his top domestic rival in the era and was probably a full 300 points below Fischer. But obviously Fischer eventually won the World Championship and had to play the best in order to do so.

Nope.   He beat the best.   

Weak compared to him maybe. 

No. If that were true, he'd not be regarded as one of the best players ever