The problem with ultimate guitar/guitartab/911tabs/tabnabber and ttabs is that anyone there can submit a bass tab or guitar tab or even the chord version of the song and even though only a few of us musicians know theyre written in the wrong key, they still rate their tabs high and people get confused when they play them.
i rather use e-chords as a reference people there know what they are tabbing
+ if i was the ultimate guitar administrator at least for bass tabs or piano tabs i would use the same tab submission form we have here on bigbasstabs and put each pending tab in a forum and let bass players decide wether its worth going on the page or not.