Some games I like more because of its flaws, like Smash Bros Melee. But those type of games are usually considered good rather than flawed as a general description. Super Mario world is another game i like because of strange glitches that is fun to me. But what I think this thread is after is games that are generally considered flawed that we still like.
Pokémon Snap and Donkey Konga Is a couple of games I think I enjoyed more than most and they can definitely be considered flawed. In Donkey Konga for example it is possible to slam down on both bongos for all notes except claps without penalty for example making the best tactic boring.