I think Oregon and UW are much less enthusiastic than they were prior to renovations in the last 10 year (as is Haas compared to Harmon). I have been to conference bball games at UW, Stanford, USC, UCLA & ASU in the last 8 years - UW and UCLA were comparable to a Haas crowd against WSU before students are on campus (weak). The others (Stan, USC & ASU) were honestly pathetic - The Cal fans were louder than the home crowd. Other than that, I have ranked them below based on my completely biased and subjective opinions from watching on TV when Cal plays them or the occasional TV viewing of conference games.
School..........Avg Attend.....%age Capacity
UTAH.............12709............85%
AZ................14503.............99%
Cal................9974..............84%
Colo..............8236..............75%
UW...............6734..............67%
Ore...............6773..............55%
UCLA.............8230..............64%
OSU..............6077..............63%
ASU..............5819..............54%
Stanford........4283..............59%
USC..............4174..............41%
WSU.............2843..............25%
Note: After posting above and noting the strong correlation with %age of capacity,.... UA fans tend to be the most blue-hair crowd and does not appear to have any college feel to it, but a 99% capacity 14,000+ arena is still better than Haas, IMHO. UCLA also suffers a bit from a poor seating arrangement with basketball. When I was a student (and started following P12); Oregon, OSU, UW, Harmon & UCLA were the cream of the crop. The other 5 (USC, ASU, UA, WSU & LSJU) were weak. Then Lute came and changed things at Arizona. Other than a few years when Monty had LSJU rolling, Maples has always been pretty weak, IMHO.