A sneaky burglary Bard is very much possible.
A Bard is - and aways has been - a supportive class.
Look at the Order of the Stick comic (a humorous view of RPG) - the party fights while the Bard, Elan, stands in the back, plonks his lute and sings "smite, smite the evul stinky goblins, have your +1 to hit, smite, smite ...".