I, along with many others, am severely disappointed at the ending.
1) They introduce the Mother, get us to really like her, and then rush their relationship in the last episode to the point of her death (bummer). I mean, FINALLY, here is Ted's perfect woman - very kind, very similar personality, great relationship dynamic, incredibly likeable, very similar interests and wanting kids, having said kids..and then,
2) Then, they expect us to believe that after all Robin put him through, and how they just wouldn't work because they were too different and wanted different things, they somehow conclude with them (potentially) getting back together? After the death of his wife? Just feels wrong and like he was always in love with Robin (even while with the mother).
3) Barney and Robin get divorced? So the entire last season is focused on the weekend of their wedding, just to throw away their marriage 3 years in?
4) Barney's daughter - After all of Barney's declaration of love to Robin, etc., he's willing to throw it away and live the rest of his life a bachelor? Sure, it's sweet he has a daughter, but I think the better outcome would have been he and Robin getting back together and raising the daughter together, since Robin can't have kids.
5) The kids are COMPLETELY Ok with their father getting back together with his old lover after their mother has died? Yes, it's been 6 years since she died (again, major bummer that she died, huge error on the writer's part in my opinion), but again, just feels wrong to me that he'd get back together with her, the woman he loved before the Mother, and that the kids would be OK with that.
I have more complaints, but will leave it there for now.
After watching this show religiously for 7 years and being very invested in the characters (yeah, I know it's a TV show), I feel very let down and like they completely botched the ending. Really disappointing and has left me with a bad taste in my mouth.