I can't believe no one made a thread for this. I'll just post my thoughts that I've posted in other places here:
I only caught on to the series and started watching regularly in 2011 after going back and watching from the beginning. I have to say that I loved the episode.
Yes I'm upset that the mother died; I predicted it weeks ago but still, like most of you from what I can tell, never wanted to be right. Though I definitely hated some things that happened in this episode like Robin ending up with Ted after drilling it into our heads that she loved Robin, I still think the ending was fitting for what the show was about.
So putting it simply: was the finale great? Yes
Did I get what I wanted out of it: No, but like the show has drilled into our heads season after season, we can't always get what we want. I think that was point and if it wasn't then whoever you believe in, save us all.
I think the mother dying may have taught us one of the most real life lessons we'll all most likely deal with at one point or another in our lives which is the loss of a spouse.
Also have to throw this in: just because Ted ended up with Robin doesn't mean we're expected to compare his love for her to his love for Tracy.