LOL that can happen with anything though. I've seen many power struggles broken up by other people shooting their backs with BB or Masenkos. You don't have to charge that **** for long, and you can really mess a guy up like that.
Even more annoying is the getting ki blast raped during power struggles, or even eyebeams or yes, discs.
You stand still, you're gonna get killed if your opponents are smart enough. That happens not just with discs.
BTW, on a related subject, for all those people who say BB is *not* lame (yeah, right... big explosion + big damage + quick charge + instant move = n00bage)...
Disc is the perfect weapon for ****ing up annoying newbies that do nothing but BB. Hehehehe, it does have a productive use after all.
Note: I never use disc otherwise. Why bother? Freiza has r0xx0r finger beam (*g* the 'shotgun' of ki attacks), and Cell has, oh, a million other cool moves.