Return Fire, Sim Farm and some of the others mentioned - especially a modern CD-ROM based Wing Commander & Doom of course. Had the Amiga done a better job of keeping up software wise, *we* (wife at the time really wanted Sim Farm) would have either not jumped ship to a 386 or would have put off a clone purchase until several years later. Hell, I might not have EVER gone to the dark side for a bit had more games been released.
Other titles I would have liked to had seen would be official licensed arcade perfect ports of vintage arcade games. Donkey Kong, DK Jr., Dk III, Omega Race, Centipede, Galaga,Tempest, Zoo Keeper, Ms. Pac-Man, Tutankham, stuff like that. The shareware and homebrews have never been able to really satisfy. The translations of some of the games though we had back in the day *were* excellent: Qix and Bomb Jack come to mind. R-type also I guess. For such a capable gaming system as it was/is, Amiga should have had more console-friendly titles too w/ an enhanced controller right away. Something with at least 2 discrete buttons, but really - Amiga should have had a CD32 like controller right off the bat so developers could have taken advantage of it. Ironic that a next gen computer was (mainly) using Atari 2600 style controllers most its life

And for that matter: games/software on floppy. CD-ROM should have been better integrated and pushed with the Amiga. Excellent platform for it and you can't help but wonder *IF* CD-ROM was more of a standard, the Amiga more than likely *would* have had more clone conversions. Lots of ifs here, I know - but jeez, some of these concepts seem so simple today and we're not just talking hindsight being 20/20 either. Every time I pick up a classic Amiga mag, the same message is resonated: c'mon Commodore, market your machines AND get that blasted CD-ROM technology into more peoples hands.