Gladiator above Thanos is ridiculous. Thanos also once said he never wanted to fight the Hulk...and we all know how that fight would go.
Also, that 100x the speed of light thing seems enormously embellished. Travel speed and fight speed are 2 different things, and in both those panels posted on this thread, Thor is at least getting some hits in. If Glads was that fast in a fight, no one, not even Thor, would lay a hand on him. And we all know this isn't the case. And if he should be able to speedblitz people at that speed, why isn't he shown doing it more...the lack of examples of this suggests limitations to his stated abilities.
And as long as we're listing everything the characters 'should' be able to do, apparently Sentry has the power of 'a thousand exploding suns'. I don't believe this at all, but if Glads can fight 100x the speed of light, then Sentry gets to have the power of 1000 supernovas.
I agree that Gladiator is better than Thor, but not by a ton...and certainly neither is at Thanos' level. I think the incident with Ego is wrongly overshadowing the myriad examples we have of Gladiator being no better than Thor level.
-DM