I think the only way to tell my opinion about the Red, Blue, Green and Yellow temples is this.
"FFFFFFFFFFFFFFFFFFFFFFFFFFFUU UUUUUUUUUUUUUUUUUUUUUUUUUUUUU UUUUUUUUUUUUU-"
Seriously, it might be one of the final levels, but they don't have to put in an annoying boss fight in EVERY FOUR LEVELS.
The one I hate the most is at the red temple, you're riding a missile through a labyrinth of electric walls in order to escape from the Mecha creepbear.
You can only hit him by knocking him into the electric walls. The problem? You gotta do this about 10 times and every hit you receive is FATAL.