I actually liked Opposing Force and Blue Shift better than HL1 back when they were still new. Recently I thought I would play through them all again, but I only made it a little way into the original before I quit. Going back to old mechanics is not generally enjoyable for me. Or maybe I should have just skipped HL1 and gone directly to the ones I liked better. To be fair, I skipped ahead to HL2 and am still struggling to enjoy the dated mechanics.