Rogers Place - 22
VAN - 8
SJ - 12
Pitt - 24
BOS - 24
LA - 32
Anahiem - 22
Cbus - 27
Tor - 8
Phi - 7 (not guaranteed correct. accessible seating map was from 76ers seating charts)
Dal - 13
NYI - 25
Mon - 5
Wpg - 8
Cgy - 4?
Those are the arenas that had easy to find, well defined maps for accessible seating locations via google image search. Seems to me that Rogers Place is well above the league average (mean-16, median-13). If you just compare it to the US arenas it is at the lower end (only Phi, SJ, Dal lower) but is still right around the mean(20.8) and median(23) averages
Note that not all of the areas counted are necessarily wheelchair platforms. Some areas may be limited mobility areas(crutches/canes/walkers) or hearing/visually impaired seating.
TLDR; nope, it's about average.