Please reply with your thoughts.
Yes, The Lost Frontier is canon, although there were some...oddities throughout the game (I'm looking at you, Dark Daxter). The game wasn't fantastic, but it's not as bad as people make it out to be. It was a fun little handheld game that did what it was supposed to do, provide an interesting adventure starring our heroes. It wasn't the best executed title, but I won't take away some of the advances it made story wise.
They are known for let downs, and the game is a piece of crap.
Dark Daxter, more character changes, and Kiera becoming a sage.... makes me shudder just thinking about it. I didn't even finish the game it was that wierd.
I would consider Jak X canon before Lost Frontier