Running 15 Burnas in a wagon, they can act as a horde killer or possibly an elite killer with I4 Power weapons on the charge. Roll 12 hop out flame away with five or so then charge the rest in with 10 power weapons left over.
I disagree with Elessar, Burnas are hella useful, probably not AS useful as Lootas but put 10 in a Battlewagon, and you can disintegrate marine squads in a single shooting phase. (decent armor vs 99 hits? eh) Coupled with a deffrolla you can even pop rhinos or tanks and then torch the guys inside.
I dunno how an all burna fighting force would work, but if you take a bunch of Power Klaws as well, you should be able to kill at least a few tanks. Eldar will still give you trouble though.
EDIT: My entire post has been said already...My bad.
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