i typically view combat speed as a simple ability to overwhelm an opponent with physical attacks before the person can react to said attacks. glads is one of the very few in marvel who can blitz by that definition--many dc characters have shown that ability. using my own personal definition, i'd say:
thor--25
current hulk--30
spiderman--75
silver surfer--n/a (he's never performed that type of attack before, though he has used energy--still, i won't rate him, but by powerset, he should be at least as fast, or be able to perceive and react to attacks at least glads' level)
sentry--80
odd grouping though. it's really apples and oranges and difficult to gauge. can danny throw more punches than thor in, say, a 5sec span? i'd say yes, at least based on feats. does that mean thor COULDN'T throw as many punches? not sure about that. i'm using my limited definition, and what i've seen on panel. it doesn't follow necessarily that a much slower opponent would be unable to react DURING said blitz though. this is very difficult to sort through tbh.