People have a bad taste for Game Maker because so many people will download it, read the first tutorial and make some horribly bad game and then post it 10 times because they're so proud of it.
People don't realize that Game Maker is an engine, just like Torque is for Blockland and Source is for Valve games. Obviously its a lower caliber engine, but its got heaps of potential.
I could list plenty of good examples, including one of people's all time favorite indie game
Spelunky,This pretty cool metroid/castlevania styled sidescroller
Iji, or this
roller coaster building game.