Hm, well, since you have Phantasy Star, There isn't much else I can think of...
Eh...
No, some of the games weren't that great, some were even bad.
But "Alex Kidd in Miracle World" was okay.
And "Decap Attack" is the result of "Psycho Fox" being released in Japan, then here,
then in japan again, and back here, but it took so long they put it on the Genesis instead...
*I think...*
So if you like D.A., go for "Psycho Fox".
Oh, and "Hang-On" is okay, but the controls are float-y, so if you already have "Super Hang-On", forget it.