I wish I had the eloquency to elaborate on it, but I'm in the "the finale was terrible" camp, too. It wasn't all bad and had some really nice moments, but (1) destroying Robin/Barney in one episode, (2) letting the mother die like it's no big deal with no time for the audience to grief and (3) having Ted end up with Robin was simply enough for me. I still love the series and the characters, but this finale was utter bullshit and a slap in the face to the fans.
I'm looking forward to what exactly the alternate ending on the DVD will be. Any news on that?
They didn't shoot a real alternate ending. They just cut it differently.
So it might not be that much different from the fan made ending on Youtube.