Well the RT ranking (which is more critic based) is as follows
1) Spider-man 2 (94%)
2) Spider-man (89%)
3) The Amazing Spider-man (73%)
4) Spider-man 3 (63%)
5) The Amazing Spider-man 2 (54%)
While Flixter (which is more general audience) is as follows
1) Spider-man 2 (81%)
2) The Amazing Spider-man (78%)
3) The Amazing Spider-man 2 (75%)
4) Spider-man (67%)
5) Spider-Man 3 (51%)
I tend to agree with flixter's ratings more because RT for the fact its more general audience based and RT tends to be "initial reaction" based rather than "test of time" based