I'm all for it if it's a remake of a film which left room for improvement to begin with. Such as The Fly and The Blob; both were mediocre little films with a solid concept but done cheaply and without any real thought or exploration. Their respective remakes, however, took the main idea from each and improved upon them in every conceivable way.
Then you have remakes which take the core ideas of their originals and approach them from a different angle. That doesn't necessarily mean a better angle; merely a different one. Such as Dawn of the Dead '04, which doesn't even bother trying to be the allegorical masterpiece the original is; rather, it takes the main idea of zombies and a shopping mall and creates an entirely new story and tone. The same for My Bloody Valentine; rather than a story about a crazy miner slashing people, they took that key idea and turned it into a whodunnit, and in 3D no less. It might not be better than the original (though I personally think it is) but it at the very least approached the material from a new angle.
But then you have remakes which fail to not only be at least as good as their originals, they also don't attempt to bring anything new to the table. The remakes of Psycho, Texas Chainsaw Massacre, Black Christmas, Friday the 13th, A Nightmare on Elm Street, When a Stranger Calls, Prom Night are all cases in point. And if you're not even going to try to be as good as or different from the source material, I have to ask -- and pardon my French ahead of time -- what the fuck is the point?
As for a Jaws remake -- I'm not a fan at all so for my money, ANY remake would only be an improvement.