I really really loved the Jak and Daxter series. Although I didn't play the first one, the second, third and racing games were awesome. Played those a lot. Especially number 3, which I almost got to 100% completion, and Jak X (Although a scratch on the disk prevented me from going further than I would have liked to).
The one that I really didn't enjoy though was Jak and Daxter: The lost frontier.
As a standalone game it was alright, but it didn't fit in to the series at all. All of the core elements were gone (Such as using Eco to boost your performance or different types of weapons). The animation and art style had changed. Most voice actors had changed and all of the comedic relief from the first games was gone. I believe the reason for the huge change was the change in developers. Instead of Naughty dog, it was rather High Impact games who opted for a more "Kid friendly" game. Jak and Daxter was never really for children. While nothing blatant was in it, there were lots of innuendos and adult jokes/references. And that was all removed in this game.
There was some good about it. The jet fighting was fun, but it was dull outside of a main mission as enemy spawns were decreased. Being able to upgrade weapons was also alright. You could get some good upgrades, but you had to find them throughout the world.
The actual game was alright, but it just didn't fit in to the series at all. So it didn't meet my expectations when I picked it up