My brother loves all of his movies, even the recent straight to DVD ones, but I have tended to avoid them because I dont want them to tarnish the early ones. As I said before, they are dumb fun, but they have a certain charm that could be tainted. Its the same with pretty much all those straight to DVD guys like Ludgren, Snipes & Van Damme etc.
I think the most recent Seagal movies I have seen were Exit Wounds (which I liked) and the one with Kurt Russell, where he dies in the opening scene (Executive decision?).