Those who are jealous of a bard's awesome quotient frequently dismiss them as "signing". Bards need not sing.
Bards can dance... and with Tumble and Improved Unarmed Strike, they are practicing Capoeria.
Bards can use the drums... and light maces + percussion skill + two-weapon fighting is a nasty-fun combination.
Bards can orate. Don't believe that's effective? Listen to the St. Crispin's Day speech (especially with a Ghost-sound provided orchestra rising the background) and don't get stirred.
Bards can do comedy. A bard who tells puns, inspiring his allies to hit people harder.
Bards can chant, and that's a freaky one. A bunch of dwarves, lead by their bard, each chanting in unison. "I wanna be a dwarven fighter/smashing orcs and other blighters."
Bards can use stringed instruments. Bards with high enough ranks in Fiddle automatically have a golden fiddle.1
More importantly, though, bards tell stories. Bards tell the stories of our adventures, they tell stories about their unending fidelity, and they tell stories about your fighters hygeine that have to be smelled to believe. What do beguilers do? It's right in the name: they lie. Beguilers lie like dogs, and cannot be trusted. They use the fact that Wizards, bereft of any remaining awesome (having spent it ALL on bards), were forced to give beguilers mechanical crutches to get around the fact that they lie and they smell funny. And carry diseases.
It is well known that bards are all fantastically endowed paragons of their gender, while beguilers are lying, disease-ridden deviates... and not even the fun kind of deviates. The kind of deviates that even make Blackguards go "That dude has something seriously wrong with him." And I'm not talking pansy blackguards. I'm talking the kind of blackguards who were paladins until they tasted their first baby and said "Yum. I think I'll eat more of these."
So play a bard. Because bards are awesome. And beguilers cheat at cards. ALL THE TIME.
1Golden fiddle not included. Offer void in certain Crystal Spheres. Consult your local overdeity for details.