This game was awesome.. until the focus became essentially useless in the big open rooms in original. It got the point where using focus actually made everything worse for me. Awesome design, but i might preferred the strategy rooms over the twitch rooms.
Personally, i feel the rockets are a bit underpowered. the weapons after it blow it out of the water and the (cheaper) weapon before it is better in the long run, even if the rocket does a little more damage.