What are the games you "know" are no good, but you nevertheless return to them regularly?

For me, some examples:

• Ivanhoe: unresponsive controls make this one quite frustrating. Yet, the levels are quite varied and well-designed.
• Gobliins 2: reading my own reviews, it seems this is the worst of the series. Yet whenever I feel like starting one up, I pick this one. It just feels most instantly accessible.
• Prince: I guess this one really is simple nostalgia.
• Metal Marines: technical issues, including non-solvable slowdowns to the degree of becoming uncontrollable; also no real tactical depth; still fun.
• Sim Copter: looks like crap, no real goal or even much gameplay. Still strong fascination.
• Hot Wheels: see Sim Copter