Most of the titles so far are good, minus a few throwaways like Dr Robotnik and Sonic Spinball. Alex Kidd is lame but I get why it's there and I don't like Toejam and Earl at all but I know some people do. Street Fighter is also a complete waste because the controls on a 3 button pad are absurd.
But assuming everything is handled well with this I'll definitely be getting one, mostly because my Genesis doesn't work well and I like that games like Thunder Force 3, Bloodlines and Hard Corps are included. Also cool that they got the rights to the Disney games because I really like Castle of Illusion. Regarding the unannounced titles, obviously Phantasy Star 2 better be there along with Revenge of Shinobi and Sonic 3 but I'm hoping more obscure games like Mystic Defender and M.U.S.H.A. also make the cut.