Surprised that it wasn't as profusely silly as the Shartopus, Mega Shark Octupus, Crocsaurous DinoCroc etc movies. Eric Balfour added some quality to the cast, the script had some decent scenes/dialogue, and the monster was played 70s style for the most part. And it was well shot with solid tech grades.
Of course... the film faltered in the narrative / plot department. The script waited far, far too long to tie in the main cast with Dinoshark killing stuff. Both narratives seemed to run on two separate story lines, and when their tracks finally crossed, it was too late and the movie had become tiresome.
My favorite giant sea monster direct-to-DVD pic of the post millennium is still OCTOPUS.