I'm a big fan of taking BART to SFO. There really is no better way to get to SFO from the East Bay. But, I've sensed that many people are more reluctant to take BART to OAK. I feel the same way for various reasons. For one, the Coliseum stop is not the safest station. And AirBART shuttle is not as continuous as it should be. Waiting for it both ways just make passengers less willing to use BART as an option to OAK. Then, there's the transfer requirement for those of us on the Pittsburg/Baypoint line. That makes me question whether I'd be saving any time at all by riding BART? I might as well just drive, and I do.
The biggest deterrents for me are MacArthur transfer and the occasional long gaps between AirBART shuttles.
What's your take on BARTing to OAK?