I still think it was awful.
Let's build towards a scenario for a decade and then let's throw it out in the last three minutes of the series. And, oh by the way, let's also build towards a wedding for the better part of two years and throw that out in two sentences.
They say they always knew the ending - I'm gonna call BS on that. If they had a plan and it ended up like this, they had a bad plan.
I had a problem with Robin and Barney getting married anyway. Most of us have known a few guys like Barney in our lives, and they either a) don't get married, or b) the marriages don't stick. Career focused, see the world, people like Robin may get married, but those also don't often stick unless the spouse is willing to completely sublimate all of their personal goals to the relationship. The entire last season was basically the two of them realizing they were making a mistake and being too afraid to bail out.
The mother dying also explained why the narrator was telling this incredibly long story to his kids when the mother wasn't even in the story. I also have no problem with them giving us a surprise at the end. Part of me was a little disappointed by the ending of Friends, because it looked like Ross and Rachel actually wouldn't end up together, which would have been an interesting way to go out.
I am amazed that the actors playing the kids kept this ending under wraps for almost a decade. That is unprecedented. The producers must have shot 5 or more different endings, if for no other reason than to hide the real ending. I believe all Teds' kids' reaction shots were shot in the first two seasons, and then they just did voice overs after that.
I feel the same way about this ending that I felt about the Sopranos, this ending is better the more I think about it.