Fischer is celebrated for his great positional sense. When he faced great attackers such as Geller or Tal, he struggled.
Morphy really was a great attacking player, and probably the best attacker of his time. But Fischer wasn't especially known as an attacker. Karpov had more brilliant miniatures than Fischer!
1. Fischer
2. Kasparov
3.Tal
4. Alekhine
5. Morphy
and then I don't know...