Tapatalk is awful.

From the perspective of an observer, implementing it is atrocious and would be a great annoyance. On my iTouch, I'm constantly nagged about getting Tapatalk every time I go to a forum that has implemented it or have cleared my cookies. When others post using Tapatalk, they're usually not aware that their Tapatalk signature automatically posts a line something under the lines of "this was posted by Tapatalk on my mobile device" (not too sure if the developers have fixed it yet). It's like the annoying "sent from my iPod" signature automatically enabled if you don't turn it off and makes the poster look like an arrogant asshole.