i use painkiller on 1 class and thats my marathon/lightweight,ninja rushing class for ctf overtime, and thats in case the team are camping their flag hard and i need that extra second to sprint to their flag.
imo its extremely n00by and good players need to use skill. i hate it when some little bugger who ive killed 3 times straight runs round the corner, i fire a ton of bullets at him and because of painkiller i end up dead, never mind the fact hes had more than enough bullets to kill him twice
some people just need to get good and adapt their tactics to kill someone who is owning them rather than relying on crappy painkiller