It would be interesting to see what Spiderman can do here. I think he has a good chance to win because he is very smart, strong and has the agility to dodge the Sentinel's attacks but he isn't Colossus. I don't think he has sufficient physical strength to destroy a sentinel flat out. I see him getting a large sharp piece of debree, swinging onto the Sentinel's shoulders and stabbing it in the head for the win. I would give the fight to Spiderman 6/10.
Peter tore apart 3 Sentinels when severely weakened and Ben Reilly trashed a lot of them in the Onslaught cross over. Suffice to say one Sentinel isn't even a challenge for Spider-man.
I once saw a "Sentinel vs Celestial" thread on Killermovies