Each weapon has two forms, giving a little variety. The levels are quite long and can take a few hours to get through. In many levels you can return to your dragon at any time and take off to explore other parts of the level. This non-linearity is a rarity in action games, and it opens up the game to exploration. As in most of these games, there's a number of hidden treasure caches for you to find, and this adds to the replayability.
Enemies are reasonably smart.
The short goblins will duck to avoid slashes at your normal height, while the large Wartoks will block with their shields and use their reach to their advantage. They scurry away when you make a bombing run from the back of Arokh, and they try to set traps for you. There's four skill levels, and I found the second of them fairly difficult. If you're used to the charge-in tactics of the Quake marine, you'll need to take a deep breath and get used to stealth and skill. Your circle-strafe skills will come in handy, though.