I have recently finished watching Dexter and HIMYM and was pretty disappointed with how it ended and wanted to bring this to the forums to hear what their most hated ending to a TV series. I haven't devoted years to them as some have so I can understand why some people get so emotional over the finale.
I was also disappointed by Lost and didn't get that finale, when they started to time travel and just pick-up in the future is when I started to lose interest. I know for a lot of folks it was the Sopranos, but I never got into it.
So who is your Dexter?