Maybe the villains are lame but besides this and 107, that's about it for classic covers. 101 and 103 are good. 115 decent but Spidey's floating head is a distraction. 116 is pretty cool. Other than that it's a word balloon party. Later on 1 or 2 Steranko covers are classic like 153 167
I think the early run of Strange Tales has some of the best covers of the era: 101-105, 107, 108, 114-116, 118, 120 are all pretty solid efforts, with a few (107 and 108 for sure) that can be considered classics.
Yes, "classic" is the operative word. Not masterpieces by any stretch of the imagination, but still fun to read.