Luckily, Katie Atkinson from EW has already said much of what I am thinking and much more eloquently than I ever could. So, read that first and then come back here for some of my own thoughts.
Oh, and SPOILER ALERT...obviously.
While I did like the concept of having the last season take place during the weekend of Robin and Barney's wedding and I really loved the flash backwards and forwards, I think some different time management would have helped. I really hated Marshall's road trip with Sherri Shepard. It was painful to watch. I love the show because of the chemistry in the group, not because of their interactions with strangers. I also wish Marshall and Lily would have fought less. That got old, too. I would have used time saved from cutting out Sherri and the fighting to put in more of The Mom. She and Ted were amazing together! The umbrella scene alone had me swooning and wishing for storm clouds.
I did really like Robin and Barney together and rooted for them as they learned how to be in a committed relationship. I wasn't sure their wedding would actually take place, though, which should have been a huge red flag. Not that people don't get cold feet before tying the knot, but they both freaked out so much the weekend of the wedding that should we really be surprised that they only last three years?
So much of how Ted met The Mother had to do with being in the right place at the right time. Remember all those clues over the years? The yellow umbrella! She was in his class! He went on a date with her roommate! The timing of the universe wasn't right for Ted and The Mom until they met at the wedding, but the timing for Robin and Ted wasn't right until many years later. Had they gotten married instead of Barney and Robin, I don't think it would have been a happy marriage, either. Ted was made to be a dorky dad and Robin was made to be a career woman. Their lives couldn't fit until many years later. But they did end up fitting. I love that.
I feel like Ted got to have two great loves of his life and maybe he doesn't deserve that, but it makes me happy. Sure, it's sad that The Mom dies, but, honestly, that's how things sometimes go and they obviously made the most of their decade together. Maybe the writers were trying to warn us when Ted saw her in her dress before the wedding. I don't believe in bad luck, but I do believe that things are shown for a reason in shows and movies.
I like that the show went full circle with Robin and Ted. In probably my most dorky thought ever, How I Met Your Mother was kind of like the blue french horn that started the whole thing. It begins and ends with Robin, but there's a bunch of crazy stuff in between. And that's not to say I didn't love The Mom. I did, I really did. But it's always been about Robin. And six years after Tracy died, it was time for Robin and Ted.