Yep, the mecha fights in Gobuster were a highlight. Shinkenger's my favorite Sentai, but even I got tired of them immediately forming the Ika buster and one-shotting the enemy. Sometimes they wouldn't even fight in combined form. Just stock combining animation to stock firing animation to victory pose with explosion. Gobuster's mecha fights are a breath of fresh air.

One thing I'll give Shinken is how they brought together the most random assortment of animals, and shapes, and brought them together into something cohesive. I liked that Ika Buster/Samurai Battle Cannon though. They over-spammed it but the design I liked.

toy wise clusters are fun to put to gether, but in the show when it becomes the only mech they use after they get it takes away from the power of "all the zords in one".

Exactly this. Once they reach an ultimate form they power-spam it every episode afterward. I don't think Boukenger/Operation Overdrive did though. And Mystic Force/Magiranger did use Magiking/Titan Megazord after recieving Manticore Megazord (What was the Magi name again?). Samurai/Shinken powerspammed the hell out of it's ultimate form. And I still want to know how you get the damn thing airborne, let alone make it flip and then land without it destroying itself under it's own weight.

Well, it brings it back to the classic argument of "Why don't they start the battle with their strongest move?"
And when they finally do decide to do that (Kiva going Emperor at the start of a fight, Megazords beginning battles with their ultimate combination, Rangers going straight from unmorphed to super mode, etc) everyone suddenly has a problem with it?

I much prefer how Magiranger/Mystic Force did it which skipped the whole arguement all together. There was no real Ultimate Combination. Just a selection of seperate Mecha where nothing combined. That and Boukenger. They used a plentiful amount of other combinations aside from the 'ultimate'.

That's one of the suckiest parts about how much toy sales dictate these shows. Even if the power has a catch, like PuToTyra and whatnot, the writers are pretty much forced to have the rider or ranger overcome that immediately so it can keep appearing for toy sales. Rubbish, I tell you.

Like how Ichigo used his Bankai and the power of it cracked his bones, but the next time he used it it was fine and never explained why.

Well, in the case of PuToTyra Eiji never really had control. Granted, he calmed down hella quick, but he was still raging, at the very least.

But when it comes to Rangers and Sentai, yeah, it's annoying.

That's because whatever damage his Bankai did was nothing compared to the train wreck that was Bleach's story.

I love Bleach :(