I am just going to say it:
Kamen Rider W didn´t have a good story.
This was a big issue for me and it really took me out of the show because the story is usually what i enjoy the most, and even if W had good action, concepts, characters and what have you, the main story line of the show was incredibly bland and uninteresting.
I mean, all the backstory of the show is very good, i throughly enjoyed the Skull back story, the Accel side story, and i am pretty sure no one loves the Eternal movie more than me, but the main plot was too simple and not very good.
The weekly plots were very well done and the characters helped to carry the whole thing, but the show coud never really build up into something great because the lack of an engaging story and that kept dragging everything down. Seriously, not for one moment i felt interested in Museum and Terror´s plans, and you could literally figure out Philip´s identity from the clues in episode 3 alone, the fact that this "plot twist" was only revealed in episode 38 only made it worse.
I like W, but i don´t love it, and i feel the need to bring this up because now that W´s writer, Riku Sanjo, is wrting Kyoryuger, people are wondering if W was a a one time wonder hit, and so i feel the need to point out that W´s plot wasn´t really good, so if Kyuoryuger´s plot isn´t blowing anyone´s mind you should not be surprised.
Heck, if anything Kyuoryuger´s plot is an improvement over W.