tank bustas are the most obnoxious orks there are.
Warboss: OY! DER IS DEM LENGHTY TOOF DOGGY BOYZ WREKIN MAH CANZ! YOUZ FINALLY IN RAINGE KILL DEM!
Tankbusta:

OH ITS AN EMPTY RHINO!!! DAKKA
IT BOYZ
Warboss:
Like KingKraka said, if you're going against
MC heavy nids, they'll be so amazing it'll be as if you're tailoring against nids hehe.
Otherwise, I'd never use em. If you think about it, loota vs tankbusta vs burna is a really cool divide between,
Skorcha, rokkits and D3 autocannons... just realized that...