From where to where exactly? The CalTrain goes through the South Bay and San Mateo. The VTA pretty much connects all of the Valley with bus and light rail, and

From where to where exactly? The CalTrain goes through the South Bay and San Mateo. The VTA pretty much connects all of the Valley with bus and light rail, and there is always the ECR that goes along El Camino...the only way I can think of there being an issue with commuting to the South Bay via public transit is working in a more remote area of the Valley. That said, public transit is indeed slow, but it's mostly available in the area if you absolutely must take it. It covers a lot more than I think you're giving it credit for based on your choice of workplace and specific area of living though.