I couldn't do this. I'd have enough trouble even narrowing it down to my top 3 Jonathon Richman gigs or top 3 this year, or something. A lot of gigs I go to are very good. :-)
As for crap ones, I seem to have blanked a lot of them out. The only ones that come easily to mind are both from this year (Mars Volta & Anthony & The Johnsons - hello, Mr Milk).