I agree it is awful, however PETA are known for being a little crazy wrong about things at times. I would be wary of the stats they are quoting e.g. about the stun guns not working, I don't know the stats but I suspect they arn't as bad as PETA would claim. Also the kicking from the stunned animals does not necissarily mean they are awake and feeling pain. It is often just random nerves firing due to the stunning.
It is also illegal to treat pigs like that in Britain so I go out of my way to never buy pork from outside the UK. As long as you are careful when reading labels you will not be buying meat that has been treated like that.
Be aware however of ritually slaughtered meat, the animals ARE awake and do feel pain whatever the apologists say about it being 'kinder'. Many places just use halal/kosher meat without labels like in Subway. Be prepared to ask about the meat if you are in doubt.