I think they should have had Ted meeting the mother a lot closer to the start of the episode. You know that Barney and Robin are already divorced by the time Ted and the mother meet. I never really felt much attachment to the mother. I think the jumping around in time didn't allow for much connection with her. At least in the last episode. I hate how they basically undid most of the character development of the last few years. After the whole season spent on the weekend leading up to Barney and Robin's wedding it was really aggravating to have it all undone within a few minutes. Ted and Robin ended up together, maybe. I don't remember if she stopped moving around for her job enough to have a real relationship. It showed when didn't when she and Barney split. For Ted to try with her again just seems idiotic. Again, undoing the character growth. The characters were in the end basically the same as they were at the start. Except for Barney.