I'm just sort of on the fence. I don't mind the movies, in fact I kind of prefer 'em over the TV series because they actually make some real use of the time travel aspect, rather than just dicking around in 2002 for 5 minutes. Admittedly, they go back in time to Toei's Kyoto Studio a lot, but that is the company's specialty.
On the flip side, the movies are mostly fluff runarounds with some interesting bits, and only Final Countdown comes close to what I'd call "necessary" since it dealt with Ryôtarô's own future, which I think is something you should address if you're going to involve time travel as a regular feature. There was a depth to the TV series that's missing now, I can agree with that. At the end of the day it's just one more Rider show though, and even if it didn't always strike a chord with me, it clearly did with somebody.
I do hate episode 15's cliffhanger though. Passionately.