User blog comment:Mmpratt99 deviantart/A Question About Accents/@comment-10950063-20140730014834

It can go either way. It can be done well, but it can also be annoying and gimmicky, or it can just be distracting. Part of it comes down to whether or not the character really needs to talk that way. Is there a good reason they're Cockney or does it feel contrived?

I guess it need clarifying: are you talking about dialogue or the whole text?