What was the most notorious 5 man instances in wow?
What i mean by notorious i mean by hard, buggy, broken, unfair mechanics and class stacking etc?
Now if i had to make a list from each xpac i would say
1. Vanilla - Stratholme
2. BC - Shattered halls
3. Wrath - Halls of Lightening
4. Cata - Grim Batol
5. Mop - Shado Pan Monastery
6. WoD - Grimrail Depot