They really do a great job of displaying some very interesting works of contemporary art you would not see anywhere else.
When I was there in 4/14, I was most impressed with how many sound sculptures they have which obviously makes for both an exciting visual and auditory experience. I'm not a fan of photography but of course pay homage to Cindy Sherman. Even the main painter they had on display is doing unique designs that are tributes to migrant farm workers. Make sure to listen to the video of her pleasantly describing her process.
A ticket here gets you admission also at their museum in La Jolla for one week. The pictures you see at the top of the page here are actually from that museum. Indeed, the boat sculpture is pretty amazing though I would say one of few interesting works here. Make a day of walking around the shops and eating in La Jolla, but don't make a trip up here solely to go to this part of their museum.
Thus far, I would not consider San Diego much of an art mecca, but this museum and the San Diego Art Institute in Balboa Park (where they display really terrific pieces of art by students) will keep those starved for some art here entertained.