After watching all 9 seasons. I feel the show was a big waste of time.
For 8 years Ted, was always looking for his true love.
He meets a very NICE and fun loving lady in season 9, who should had been on the show earlier. She was more alive than the others.
He dates the mother of his children for two hours she dies, and he goes back to Robin.
So, the whole story line is, he met a very nice fun loving women at Robins wedding and had two children. And, when she dies, he goes back to Robin.
The whole 8 season up to the 9th is Barney dating women for one night stands, and Ted dating Robin and other women. If Barney would not have been there, the show would have died in the very 1st season.
