Looking at ESPN's center rankings today. Gortat ranked as the 21st best center this year. Last year he was ranked as the 13th best center. Certainly the list is flawed. Duncan was listed as a PF this year, last year as a center. Horford was a C last year, now he's a PF. (Glen Rice Jr. is listed as a PG) Still its an interesting comparison.
The first number listed is the player rank as a center. The second number is their overall rank among all players. I've included current and former Wizards of all positions for fun.
1. Dwight Howard 7
2. Marc Gasol 10
3. Lamarcus Aldridge 17
John Wall 21
4. Roy Hibbert 22
5. Joakim Noah 23
6. Brook. Lopez 28
7. Tyson Chandler 37
8. Damarcu Cousins 40
9. Greg Monroe 42
10. Larry Sanders 45
11. David Lee 51
12. Al Jefferson 52
13. Nikola Pekovic 53
14. Andre Drummond 54
15. Anderson Verajao 62
16. Omer Asik 64
17. Andrew Bogut 65
Bradley Beal 73
18. Nene 75
19. Deandre Jordan 80
20. Jonas Valanciunas 82
21. Marcin Gortat 87
22. Nikola Vucevic 97
23. Javale McGee 98
24. Andrew Bynum
25. Tiago Splitter
26. Enes Kanter 112
27. Robin Lopez 128
28. Andray Blatche 137
29. Emeka Okafor 138
30. Andrea Bargnani 143
31. Kosta Koufos 150
32. Cody Zeller 166
Martell Webster 175
33. Chris Kaman 176
34. Spencer Hawes 179
Trevor Ariza 194
35. Brandan Wright 195
36. Boris Diaw 196
37. Samuel Dalembert 205
Otto Porter 207
Mike Miller 211
38. Zaza Pachulia 212
39. Nerlens Noel 221
Eric Maynor 226
Nick Young 228
40. Jordan Hill 237
Alonzo Gee 241
41. Tyler Zeller 250
Jordan Crawford 252
Steve Blake 253
42. Meyers Leonard 255
43. Dejuan Blair 256
44. Kendrick Perkins 259
Kevin Seraphin 263 (listed as PF)
Antawn Jamison 266
45. Festus Ezeli 267
46. Alex Len 269
47. Ian Mahinmi 271
48. Lavoy Allen 272
Sean Livingston 273
49. Timofey Mozgov 275
Al Harrington 278 (2012 rank 143)
50. Greg Oden 284
Shannon Brown 285 (almost Wizard)
Jan Vesely 296
51. Byron Mullens 299
Trevor Booker 303
52. Joel Anthony 311
53. Jermaine O'Neal 312
54. Brendan Haywood 315
Kendall Marshall 320 (another almost Wizard)
55. Gorgui Dieng 327
Chris Singleton 333
Glen Rice Jr. 338
56. Aaron Gray 345
57. Hasheem Thabeet 347
58. Nazr Mohammed 348
59. Greg Stiemsma 350
Josh Childress 361
60. Ronny Turiaf 362
61. Marcus Camby 363
Roger Mason Jr. 384
62. Jeff Withey 387
Jannero Pargo 390
Mike James 392 (listed as a free agent, as are some others)
63. Joel Pryzbilla 393
Malcom Lee 396 (almost Wizard)
64. Earl Barron 404
65. Steven Adams 406
Garrett Temple 417
66. Rudy Gobert 423
67. Ryan Hollins 426
68. Bernard James 427
Shelvin Mack 431
69. Jason Collins 448
70. Kwame Brown 450
71. Viacheslav Kravstov 453
72. Cole Aldrich 459
73. Arsalan Kazemi 466
Shavlik Randolph 467
74. Daniel Orton 479
75. Desagana Diop 480
76. Vitor Faverani 481
77. Dexter Pittman 488
78. Miroslav Raduljica 497
79. Jordan Henriquez 498
80. Fab Melo 499
Royce White 500 (if you were curious who was ranked last)
58. Hamed Hadidi