I have to go way back to the time I only played the few games I could get my hands on, and since I was a child they left a big impression on me even they were not that good (to the point I haver them both displayed in my office / game room)
A stupidly difficult game that I never completed as a kid but I finally did it with a guide a couple of years ago. Still, the first time I loaded the tape in my Atari and the "Logon Please" pormpt showed up, I was completely blown away.
Just three dumb mini games I guess, but the Ghostbusters theme and the speech sample at the start (it was 1984) got me playing this over and over on my Atari 130XE.
I have some really fond memories of OverBlood 2 on PSOne. The graphics were awful, the plot was weak, the voice-acting was terrible, and the combat was awkward. And yet - and yet - I loved the hell out of it.