Robin's character is just getting too outrageous, and she does look a lot different. In the first few seasons she was calm, cool, and collected, but now she is getting ridiculous. In my opinion, I have always thought that Robin was the weakest character in the main group in terms of what to expect from her as an character, and I don't like it how the show is focusing on her on her relationship with Kevin as one of the main plot lines for this season. Robin should be one of those characters that add support instead of outright leading the plot. Kevin's character seems like he doesn't have the flow or the timing down with the rest of the cast, and that may be due to the writing or poor acting but he just doesn't seem like he is a natural fit. It wouldn't bother me to see him gone.
I kind of wish that the show revolved more around Barney and his own personal growth. I know that everyone enjoys his shallow depth-based humor, and so do I, but I also enjoyed the plot where his dad wanted to get back together with him. Maybe the writers will go back to that since there some loose ends with that plot, but Barney's character will probably experience more growth since they have showed him getting ready for his wedding. I hope it's not with Robin, and it annoys me when the show hints that either Ted or Barney wants her back.
In regards of having the show ending soon, I think that it is about getting to wrap here in about the next 2 season. The problem with that is, I don't think the writers have settled on who the mother is supposed be. This will be at least a season long plot line since they will show episodes up to when Ted gets married. Not to mention that all of Ted's serious relationship have last about a season- Robin, Stella, and Zoey.
Sorry about the long post, but this is just some ramblings from an HIMYM enthusiast. Also this may be longest in-depth post that I have ever had.