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Though one should always include the caveat that HD streams aren't going to look as good as a high-bitrate copy like a Blu-Ray, usually at any rate. It's gotten better, and you can still enjoy the movie of course but people who really care about stuff like film grain and color fidelity (and Criterion's clientele is often this type of person) should seek out a non-streaming version.

I highly second the recommendation of the Criterion Collection. Nothing that they selected has disappointed me and their passion for film shines through their restorations, interviews, and essays.

Do the Hulu Criterion streams include extras like commentary and making-of interviews?

No, these are restricted to the discs. Don't want to give too much away :)

No, they don't. It's just the film and subtitles, if applicable.