He's doing something right:
Current NBA Coaches (By Win%)
.658 (412-214) Popovich SA
.648 (171-93) Carlisle IND
.618 (925-572) Sloan UTH
.617 (671-416) Adelman SAC
.578 (301-220) Van Gundy HOU
.573 (1161-865) Nelson DAL
.567 (944-721) Brown DET
.565 (398-306) Saunders MIN
.565 (148-114) Cheeks POR
.559 (513-405) Tomjanovich LAL
.552 (575-466) Fratello MEM
.539 (55-47) Van Gundy MIA
.537 (1324-1142) Wilkens NY
.530 (176-156) McMillan SEA
.525 (145-131) O'Brien PHL
.517 (30-28) Frank NJN
.500 (178-178) Rivers BOS
.498 (138-139) Skiles CHI
.492 (437-451) Dunleavy LAC
.492 (150-155) Scott NO
.487 (342-360) Bickerstaff CHA
.469 (333-377) Silas CLE
.469 (46-52) Porter MIL
.461 (424-495) Brown MEM (retired)
.392 (51-79) D'Antoni PHX
.390 (71-111) Bzdelik DEN
.349 (68-127) Jordan WAS
.333 (7-14) Mitchell TOR
.316 (54-117) Davis ORL
.281 (18-46) Hollins MEM (interim)
.278 (5-13) Montgomery GS
.167 (3-15) Woodson ATL
Top 20 All-Time Coaching Victories
CoachWLPct.
1. Lenny Wilkens 1,292 1,114 .537
2. Don Nelson 1,161 865 .573
3. Pat Riley 1,110 569 .661
4. Larry Brown 944 721 .567
5. Bill Fitch 944 1,106 .460
6. Red Auerbach 938 479.662
7. Dick Motta 935 1,017 .479
8. Jerry Sloan 925 572 .618
9. Jack Ramsay 864 783 .525
10.Cotton Fitzsimmons 832 775 .518
11.Phil Jackson 831 317 .724
12.Gene Shue 784 861 .477
13.George Karl 708 499 .587
14.John MacLeod 707 657 .518
15.Red Holzman 696 604 .535
16.Rick Adelman 671 416 .617
17.Chuck Daly 638 437 .593
18.Doug Moe 628 529.543
19.Mike Fratello 575 466 .552
20.Alvin Attles 557 518.518
As an aside, you may note that on that entire list of the Top-20 Coaches in NBA history in victories, Rick's .617 Win% ranks 5th. Of all the guys who have won as many games as he has, only 4 (Jackson .724, Auerbach .662, Riley .661 and Sloan .618) have won a higher percentage of their games. Not bad company. And he'll pass Sloan up this season to leave him behind only the Holy Triumvirate of Auerbach, Riley & Jackson.