It's quicker to think of those that HAVE...
1) Iron Man- All kinds of darkness during Civil War, and apparently, afterwards.
2) Thor - Kind of set up his own kingdom on Earth under Dan Jurgens.
3) Wolverine - Brainwashed, seduced, corrupted numerous times, usually resulting in massacres galore.
4) Cyclops - "nuff said"
5) Hulk - Grey Hulk was really not a nice person, and the World War Hulk stuff (though I did not read it) seems pretty dark. And pretty much turned totally savage during the Mantlo "Crossworlds" era.
6) Daredevil - Corrupted by a demon or something during Shadowlands and straight up murdered Bullseye.
7) Vision - Took over the world under Roger Stern's reign in the 80's.
8) Yellowjacket - Slapped his wife, attacked the Avengers.
9) She Hulk - Ripped the Vision in half, thanks to...
10) Scarlet Witch - Went insane/corrupted by multiple traumas and abuses.
11) Genis Vell - Went WAY over the top during the end of his series.
12) Storm -Mohawk era.
13) Phoenix - 'nuff said'
14) Angel - "Archangel"
15) Ben, Sue and Reed from the FF, at various points...
16) Quicksilver - Started during the unfortunate treatment by Englehart in the mini series and went on for a while.
And the list could go on and on...please feel free to add those I didn't.
A listers I can think of who haven't gone overboard are Kitty, Colossus, Nightcrawler, Captain America, the Human Torch, Dr. Strange (right?), Hawkeye (though he did become a jerk), and Wasp. I"m sure I've missed some.