Double was awesome for his resourcefulness and cunning and the way he mixed his abilities for effect. I never liked CJX because it seemed like they didn't need it. (also I think it looks dumb. The SIC makes it look killer, though. And without it we wouldn't have had that incredible goodbye scene in episode 48) But even then, it was just a power boost, not super-impossible-to-defeat-I-am-the-best-ever-and-I-will-forever-remind-you levels. And then CJGX gave him the ability to fly.

This.

I personally feel that Climax Form Den-O isn't that overpowered since there is a limitation they hit later on in the series, but I won't spoil it.

Yeah. I was never a big fan of CJX's design, regardless of the rainbows of doom. It really felt more tacked on because of some rule that every Rider needs a final form so they can churn out a few more toys come episode 30 or so.

But yeah, once you get to Decade's movie, you'll be able to see that Double's cameo really was a deus ex machina in both terms of power (He's ridiculously strong in the movie with his basic forms compared to the actual series) and appearance.

Really, beyond Decade, the only Rider I'd call OP would be Kuuga thanks to alleged abilities and powers.
Perhaps Kabuto...

Re: Kiva -

I do believe what Jirou is is explained not long after his monster reveal. There is a reason he doesn't transform like a Fangire.

Split Lip:

Gatack is the main secondary Rider of Kabuto. There's just more than those two. You should've already seen TheBee too. Gatack'll show up mid-season I believe.

Yeah...the whole "his Rider Kick can destroy the world"

What is this, Dragonball Z?

Ooh!

That's just what I thought. The best things about CJX was that he used a sword and sheild and as I said, that it made for one hell of an SIC.

Like OOO in A-to-Z?

Oh yeah, I've seen TheBee. And I've fast-forwarded to 22 and apparently yet ANOTHER rider showed up. A fruity looking one with a stylish pony tail on his helmet made of a scorpion's butt-weapon.

No kidding.

I liked Sasword's design...

If you're just holding out for Gatack, I really wouldn't recommend skipping around. You miss out on so much of his character development that way... As you've noticed, it really doesn't seem like Tendou has much of a character. I'm in agreement with the group who finds Gatack to be the "real main character" of Kabuto.

To be honest, I never recommend skipping around in a series. When told "It gets better at episode [Blank]", while faster to just skip to that episode, it's easy to not like the episode where things allegedly improve by virtue of the fact that you're missing character development and introductions.

Yeah, I could never skip episodes(though I may hold out on watching one episode for an extended period of time... Man, I really need to get to watching RyuKenDo's last episode).

you take that back about the great tsurugi!!!! :mantears