First two are exceptional and really funny. Third one is still funny and really good, but starts going to a darker place. The last two aren't really good at all anymore. Goes in a wrong direction for me and loses it's funniness. It becomes some serious dark show, that has few jokes in it. Also they removed too much of the original cast and removed too much cast in a small period of time, so you learn not to like "attach" yourself to them anymore and that is nr. 1 error doing a show. People need to empathize with the characters.
Overall the 2 seasons are really worth a watch, 3 is a little less, 4-5 not at all.
Misfits is a super powered laugh machine. When the storm comes and gives supernatural abilities to a whole community, hilarious hijinx ensue. This show is a British gem and most definitely worth checking out!