I grew up with the SNES, it will be very difficult for me to resist trying to get one (I do mean trying to).
The 21 games they included for it are good choices, most of them no-brainers. I'm happy to see them. However, I feel like there should have been 35 to 40 games, at least. I could easily mention about 50 must plays for the SNES. There's no Turtles In Time (that one hurts, it's my favorite Beat 'Em Up on the SNES, and one of the best ever made), no Illusion of Gaia (one of my favorite RPGs on the system), no Donkey Kong Country 2, which I found to be better than the first (but at least the first is there). And of course most likely due to licensing and copy rights shenanigans there's no Lion King or Aladdin (Disney games). I would have also liked Zombies Ate My Neighbors, Earthworm Jim and Mortal Kombat II. Not to mention ActRaiser or even Mega Man X2 and X3. I could go on like this for weeks.
But, anyway, I'd still want one... but I won't get one. Not because I'm not happy about it, but simply because it WILL be impossible to get one. It will definitely be sold out faster than the NES Classic, and re-sellers will drain supplies dry in a matter of a few days.