I'm still not over what happened
There was so much good, even when compared with the bad, but they refused to let their conclusion evolve with the series. That is why majority of fans detest it now. That is why many people outright refuse to put any investment in anything the creators do. Personally, I would be more than happy to watch and support these creators in future endeavors, however, it is quite clear that they will not adapt the vision of their art when it outgrows the original concept.
On top of all that, it didn't help that Cristin Milioti was THE BEST embodiment of what we wanted The Mother to be. Especially after Robin had been quite clear over the years that she just didn't see Ted that way and that her marriage to Barney was completely glossed over.
"No talking from things that don't talk!" - Jaye Tyler