I agree pretty much 100% with matrix on Gokaiger. And I think you have some very valid points on Decade, but it not being fun?

Each Decade arc is a summer blockbuster. Its an hour of mindless fun with little to no ties to the next arc.

Decade 9.
Blade world done.
Tsukasa taunting and treating Kazuma like a total ass while Yusuke convinces him that Tsukasa's dickishness is actually tough love, with the series giving viewers a not so subtle way of telling us that no, Tsukasa is just being an asshole because he can.

If not for Yusuke, Kazuma would've been gone and there would be no Blade. Literally. Tsukasa may have gotten the end speech, but Yusuke was the one who convinced him to not leave or attack Tsukasa.

And no, I'm not having fun watching Decade fight. It's like watching GokaiRed. He tries to act cool and stoic, and when they're in a certain suit, it's just not fun to watch.

Also, oh boy. Kaito has finally entered the series. Talk about a blatantly OP walking plot device. I can't wait for him to slow the nonexistent story to a crawl as he spiels on about his past with Tsukasa which will NEVER be resolved :I

Laughing Technique

Note the "Tries." :p

So...we never find out what happened with the sea cucumber?

I consider that a GOOD thing.

Ohh ho ho. No.
The stunning story line of Tsukasa having not eaten a sea cucumber is never resolved.

Yep. It's pretty annoying.

Decade 10. Faiz world.
Holy crap, Kaito is played up as much of a Mary Sue as Decade was. I forgot about that.
"He's super mysterious, and he knows everything about the past, and he's a super thief, and he can threaten an immortal, and he can bribe the thugs who should just fight him, and he can just vanish out of nowhere, and he has a gun, and he can run at super speed, and he can summon other riders, and he can use cards Decade can't, and he has all the cards from the start, and he can open his own dimensional portals, and he's stronger than other Riders, and he only ever loses because he let his opponent win, and he has MY NAME!"

I swear, these are like bad fanfic characters.
Oh, and Kaito is taking up all of Yusuke's screen time. Minus 10 points to Gryffindor.