I spend a lot of time transcribing bass and guitar parts for songs I'm going to cover. Some may view this as 'not creative', but it helps me learn things I would not have thought to do otherwise. I won't always stick note-for-note to the transcription when it comes time to play, but at least I have started in the right place!
Having said that, I am fine with people doing in a completely different and off-the-wall way, but please, spare me from sloppy covers.