Definitely some TV connoisseurs on this site. I think everyone's real compliant should not be with the finale but with the season that proceeded it. All the events that happened in the finale should have been spaced out over the last season. So that audience gets to know the mother better and her death is more impactful than "lol, what?". In the last season in roughly chronological order, Robin and Barney get married (3 episodes tops because Ted and Robin have to work out issues and seem finalized), Ted is dating the Mother, Marshal and Lily don't go to Italy, Marshal becomes a judge, Lily starts painting again, the gang has normal season high jinks for a number of episodes again so that we can get to know and love the Mother, Ted and the Mother get married, Robin and Barney get divorced, Barney regresses and Robin distances herself, Every thing is sunshine and roses for Ted and the Mother but pre-finale cliff hanger the gang is all together again at the bar: Ted looks rough and the Mother isn't there.
The finale: the mother dies, the gang gets back together for the funeral and talk about their lives and how they don't see each other anymore (jokes are rehashed, good times/bad times); each gets some screen time: Marshall is supreme fudge, Lily does art for children's books, Barney finally found his true love (a scene I would save for the finale), Robin is super success but misses the people who believed in her when she was on at 3am. Robin sips that she should have married Ted. Ted gets pissed because his wife just died and he can't deal with Robin right now. [Time Passes] Ted tells his children that you have to be open to and ready to find happiness and don't be so quick to flee when things get difficult. He reflects on how he was so ready to leave the night of Robin and Barneys wedding that he almost missed meeting their Mother. [Scene at train station meeting Mother] And then the last few minutes are the same with the kids saying the story is about Aunt Robin. Blue french horn and all that.