If you think that because the lines are similar they mean the same thing, you missed the point.
It's still a fair criticism. Even if the show is claiming it's doing a "same dialogue, different emotions behind the dialogue" thing, it can still come off wrong if something gets messed up in the delivery or if the scene is written poorly enough that it just feels like a "oh well, nothing really changed" scene.
And that's kind of the ultimate problem with Gokaiger. Whatever good ideas it might have had and whatever resources it could bring to the table were utterly wasted by a going-nowhere story, defanged/stupid-as-balls/poor rip offs of better characters from Shinkenger villains, guest stars that were occasionally cool but mostly did nothing of distinctive value, and an utterly unlikeable main cast.
Hell, I find it amusing that the OP complains about Gai because Gai is one of the few things I like about Gokaiger. He's a little excitable (which I can see being annoying to some) but he's... like, an actual hero who gives a damn about things.
The most interesting remark I've heard about the last episode, on that level, is that, if you watched it on its own without knowing the rest of the show, you'd think GAI was the main hero with these jerk-ass pirate guys showing up to occasionally help out when they can be bothered to get off their selfish asses and do anything.
That's... a problem when those pirate guys are actually supposed to be your leads. :laugh: