While it is a bad Mario game, there are some parts that make it good. It has an arcade feel to it like Mario Bros, has the power-ups such as Mushrooms, fire flowers and 1up mushrooms, and getting 30 coins gives you an extra life which makes it fair than getting 100 coins like in every Mario game. Also, it has backtracking. (One of the CD-I controllers has a Sega Genesis style which is a better option to emulate the controls when having an 8BitDo SNES/PS4 style controller using X for A, Y for B, and B for C. So here's how to do the trick) For level select, hold Left and A or C to go back to a previous level, hold Right and A or C to go to the later levels, hold up and A or C to go back to the world/hotel select screen, and hold down and A or C to go to the save file to save your game. Now it doesn't have to be that bad, it's just challenging as you progress.
When it comes to Simpsons games, only 3 are good. Simpsons Arcade, Simpsons Hit & Run and The Simpsons Game. The rest are just plain awful. But, I find Bart's Nightmare an okay game. The controls are responsive, the animation isn't too bad, and gameplay is not as confusing as they say.
Another game that gets hated on, but what's decent about this is that it's little bit like a MetroidVania game before MetroidVania was invented. While the hit detection is terrible at times, the game has a short password system, unlimited continues, and secret rooms that have extra lives. While challenging, it's fine as it is.
Another bad Mario game? And it's the Lost Levels? I can understand that it's too hard and uses the same engine/assets from the first Super Mario Bros. game, but, what's wrong with having a challenge? Some of the levels in Lost Levels are easy such as 1-1, 1-2, 3-1, 3-4, 4-2, 5-2, 7-2 and 8-2. A few levels that require long jumps, strong winds, trampolines that launch you very high and land on a safe platform, warp pipes that lead you to a previous world, and poison mushrooms. But, what's wrong of going back to a previous world where you can get extra lives? I don't know. I just Mario fanatic who played this over 100 times and never get tired of it.