I think that belief is why the Sabres are overrated every year. Miller is a solid average to slightly above average starting goalie.
1. T.Thomas (38): 2yrs -116gms, .930 (career - 378gms, .921)
2. P.Rinne (30): 2yrs - 137gms, .926 (career - 250gms, .921)
3. H.Lundqvist (30): 2yrs - 130gms, .926 (career - 468gms, .920)
4. R.Luongo (33): 2yrs - 115gms, .924 (career - 727gms, .919)
5. J.Quick (27): 2yrs - 130gms, .924 (career - 249gms, .916)
6. M.Smith (30): 2yrs - 89gms, .924 (career - 229gms, .914)
7. C.Price (25): 2yrs, 137gms, .920 (career - 271gms, .916)
8. T.Vokoun (36): 2yrs - 105gms, .920 (career - 680gms, .917)
9. C.Ward (28): 2yrs - 142gms, .919 (career - 414gms, .910)
10. K.Lehtonen (29): 2yrs - 128gms, .918 (career - 344gms, .914)
11. S.Varlamov (24): 2yrs - 80gms, .918 (career - 112gms, .915)
12. A.Niemi (29): 2yrs - 128gms, .917 (career - 170gms, .915)
13. J.Halak (27): 2yrs - 103gms, .917 (career - 204gms, .918)
14. N.Backstrom (34): 2yrs - 97gms, .917 (career - 327gms, .918)
15. J.Theodore (36): 2yrs - 85gms, .917 (career - 633gms, .909)
16. J.Hiller (30): 2yrs - 122gms, .916 (career - 250gms, .918)
17. R.Miller (32): 2yrs - 127gms, .916 (career - 460gms, .915)
18. I.Bryzgalov (32): 2yrs - 127gms, .916 (career - 385gms, .915)
19. M.Fleury (28): 2yrs - 132gms, .916 (career - 434gms, .909)
20. D.Dubnyk (26): 2yrs - 82gms, .915 (career - 101gms, .910)
21. J.Howard (28): 2yrs - 120gms, .914 (career - 192gms, .917)
22. M.Kiprusoff (36): 2yrs - 141gms, .914 (career - 599gms, .914)
23. C.Anderson (31): 2yrs - 114gms, .914 (career - 294gms, .913)
24. E.Nabokov (37): 2yrs - 42gms, .914 (career - 605gms, .912)
25. J.Reimer (24): 2yrs - 71gms, .911 (career - 71gms, .911)
26. C.Crawford (28): 2yrs - 114gms, .910 (career - 122gms, .910)
27. O.Pavelec (25): 2yrs - 126gms, .910 (career - 187gms, .907)
28. S.Bobrovsky (24): 2yrs - 83gms, .909 (career - 83gms, .909)
29. M.Brodeur (40): 2yrs - 115gms, .906 (career - 1191gms, .913)
30. M.Garon (35): 2yrs - 84gms, .901 (career - 323gms, .904)
and then you have backups who could be good starters in Rask, Schneider, Lindback, Holtby, Neuvirth, etc.
Of course you take Ryan Miller ahead of less proven guys or older guys with smaller sample sizes listed ahead of him in that list, but even then, he's more of a "solid average" guy than an "elite" one.