Thing is, there are as many ways to play "evil" as there is to play "good." Trouble is, most of us have this view of evil as synonymous with "raving psychotic." Yes, it is hard to play that way, but even evil characters have senses of humor, albeit a bit "twisted." Someone who might play "lawful evil", for example, could be played as a conniving and manipulative SOB, who's totally charming on the outside. (Like Alexis (Joan Collins) on Dynasty). An evil person might keep Minsc around just to laugh at his stupidity and make fun of him, but would go to great lengths to preserve him because of the joke factor. Even Chaotic Evil characters have charm; look at Korgan and his bawdy sense of humor. So it's ok to play evil; just have fun with it. And you DON'T have to run your rep into the ground. A truly intelligent evil person wouldn't...they'd keep it around 8-10 by sanctimoniously donating at temples (Talos, of course!) and then feeling free to do their nefarious deeds. Only a total imbecilic or psychotic evil person would let their rep drop to 1 and try to take on the hordes of "do-gooders" coming after them.
The important thing is, whatever you play, is that you have fun with it.
If it becomes a chore, try something different.
Cheers,
-Sazerac