Calling Deus Ex a “Game of the Year” is an understatement of incredible proportions. It’s like calling the Pyramids the ‘rock piles of the week‘. It’s one of the best games ever made, with a literally perfect blend of nonlinear exploration and tight storyline that has arguably never been topped. It's most likely that you've already played through it countless times... but if your disc is wearing out, it might be a good time to grab a digital backup. Oh, wait, you haven't played it? What's wrong with you?!
Again, there's a caveat here. Steam brings the compilation (which includes Deus Ex 2: Invisible War) down to the £3-5 level every year, and some might be able to hold out.