My opinion
I found the game ok. It wasn't great. Just ok.
1. The gameplay didn't really have anything special attached to it. It was a first person shooter. There was nothing significant about this one to separate it from your typical first person shooter genre. Except the sword thing was a good addition. The charge time was way too quick for me, though.
2. The opponents. There was nothing special about them. They didn't get any more difficult as the game progresses on. Sure they got grenades.. which move at an incredibly slow rate enabling me to shoot it... But other than that, nothing.
3. The interface. Again, back to a first person shooter game. They usually have bars and whatnot. This was... numbers dwindling down on a screen. How fun did you expect that to be?