Here is a very brief review of the first movie (or at least what i thought of it) - Brilliant. Plenty of action, developed characters, good story line, nicely paced and well directed and acted.
Here is a very brief review of this movie - terrible.
Why you ask? Mainly because it has nothing that the original movie had. Admittedly this film doesn't have the budget that the original had, but the way that it falls down could have been solved without further expense. The characters aren't developed in any way. I can't really explain this without adding spoilers, so i won't, but believe me, there is no recognition of ANY of the "new" assassins background or any story behind their assassination "style". Lazlo Soot (a returning character) isn't in any way as likable as in the original. His whole "human face mask" approach was very refreshing in the first film, but tired and used in this attempt. He adds very little in all. As for the Tremors? They just aren't the Tremors. Simple.
The action is average at best. Nothing special to report unfortunately. A lot of it just feels very rushed- cops get killed, one or two assassins get killed, more cops get killed. Unfortunately it all happens within 5 minutes, so there isn't even a chance for some of the assassins to even attempt getting to their target.
However, the story line does end out with a fairly OK twist, even if it is slightly far fetched. It gives reasoning behind the actions of the assassins and their "contracts". Not anything special though. So it's not all too bad i guess.
In a nutshell, I would recommend that you just go watch the first one again. There's a reason as to why this release is straight-to-video. This is only my opinion though, so by all means, give it a try. You might end up liking it more than i did :)