I mean... yeah, BART is not impressive. As a visitor, I kind of _like_ it; it has a really interesting largely cohesive retrofuturistic aesthetic. (Though I don't think I'd want to use it every day; it's the _noisiest_ train I've ever experienced.) But as a train system, yeah, it's a small commuter train network with some metro-like attributes (kind of like an S-bahn). In general, with the possible exception of the New York subway, which is one of the biggest in the world, no-one is going to be impressed by any American public transport system.

I work for a multinational in Dublin, and a number of visiting Americans have commented on how good Dublin's public transport system is. Visiting Europeans generally comment on how _bad_ Dublin's public transport is, which is very much the correct response to Dublin's public transport system. But it's all relative, I suppose.