I actually don't mind Zubat that much anymore. I do really like Golbat and (especially) Crobat, and its sprites were greatly improved by the third Generation rolled around, particularly in FireRed and LeafGreen.
I'd say the biggest annoyance is when I'm fishing. ALL I GET IS MAGIKARP ;_;. You know, 'Magikarp, use a Splash attack!' Ugh lol.