I liked Project Warlock and Ion Fury - both a bit different, but enjoyable, retro-looking shooters. First one with interesting graphics, but I guess not everybody's flavor, then second one - almost exat same as Duke Nukem.
I played both couple of hours, liked it enough to return it them some day, but not to finish them like I had in habit to do with old games back in the days. Just being older and losing interest in finishing long games:)