I think Jetman suffered by casting their Rangers into forced stereotypes (Ako = Tomboy, Raita = Fat Guy, Gai = Jerk, you get the idea) and didn't really allow for real chemistry within all of them. On that episode where Raita goes back to prehistoric times, all of a sudden he was acting like he's been in love with Kaori, where nothing before ever suggested it. Then there's Gai, who… I really don't know what everyone likes so much about him? It seemed like he took way too long to accept his Ranger duties, and his extended behavior outside of being a Ranger kept showing him off as a very condescending and womanizing jerk with no gold heart at all. During that arc where the Bird Men show up, he point-blank decides to quit being a Ranger, for no reason. He was… just so annoying. Granted, maybe his behavior improves after episode 30 or so, because that episode where they go to Hell (literally) was just so flat out stupid and horrendous and since Jetman had already provided me enough stupid episodes by that point, I stopped watching.
Later on, I did get to see the Jetman finale, and it was better than the Zyuranger finale (but thats a whole 'nother rant) and I thought the wedding scene was handled real well. Many websites say that nobody notices Gai was dying, but looking at the way Ryuu and Kaori were talking about him and looking at him, I think they did know.