I'm not really an old school guy. I understand the appeal, and I've played such games and enjoyed them. I prefer a little mechanical definition to my characters, though, and eight attribute scores written on a piece of lined paper isn't enough. I like systems with skills, I like systems with merits and flaws, I like systems that provide rules for various common circumstances. That's not to say I can't wing things, or make rulings on the fly, since I do that all the time. I just like a little more framework than systems like original D&D provide.
Is Morrow Project the most old school RPG in my library? Oh, I don't know. It's a matter of opinion. I've got the original Twilight: 2000, Star Frontiers, Gamma World, AD&D, 2nd edition AD&D, Reich Star, 1st edition WFRP, Stormbringer, MERP, and a number of Palladium's old titles, to name a few. Which of them is "old schoolier" than the others? I suppose I can leave that up to you, dear reader.
So, yeah. There you go. As always, commentary is welcome.