[Matrixbeast]

Gokaiger could've done better. The characters never felt like they advanced beyond their brief backstory snippets here and there. They felt like they were the same from beginning to end.
Gai never really got on my nerves, but I can see why he would get on others.

The story itself was weak. For a pirate series, it didn't have the sense of adventure I was hoping. They talked on and on about their treasure, but that never amounted to much anything aside from the moments in the finale. I think it could've been much more interesting if they didn't begin with all but like 11 of the Ranger Keys and we actually saw the search for them.

The mech was meh. I found the base GokaiGalleon+Gokai machines to be extremely uninteresting, well the other machines, that is. They had no purpose other than to Russian doll out the Galleon and combine (I don't think we even got a token solo/uncombined fight with them). The additions did make things more interesting, but I only really liked Hurricane Gokai-Oh and Shinken Gokai-Oh.
Gai's mech...Meh. GoZyu just felt like too much of a mish-mash to find enjoyable (That may just be my inner TF fan speaking, though).

The cameos were awesome, but being relatively new to Sentai, I didn't know very many.

The villains were pitiful. Walz Gils whining felt very tired and boring, and he didn't get interesting until the end where he felt some camaraderie with Barizog. Barizog himself had a very interesting backstory that I felt could've gone somewhere. But they dropped the "It's irreversible now" line and he just blended into the wallpaper because, after that, there was literally no further his character could go. However, seeing him speak to Joe in a condescending manner during their final fight(s) was pretty awesome. Insarn and the other one (Who's name leaves me right now) were pretty meh. Kinda just...There. Ackdos and co really should've come in a lot earlier.

Also, the finale was too rushed. The Zangyack flagship took out the ENTIRE Zangyack armada? Yeah, bullshit.