They also usually add some gas to the bottles, if I remember correctly, which does affect the taste. Not necessarily for the worse, but it is noticeable. It's pretty obvious in Hobgoblin, but I still like the bottle flavour and it even survives being in a car boot in a French summer.

I imagine the only reason not to do bottles is because they're liable to being turned into projectiles, but I guess you could just serve it in one of those crap plastic glasses like they would from a cask anyway.