I've seen a lot of talk about how alignment isn't realistic, that the 9 alignment system is too strict, that the only thing the Palladium system got right was alignment, law and chaos is the way to go, good and evil are matters of perspective and more.
Alignment seems to be the one thing gamers are least likely to agree on.
Do you use alignment in your campaigns? Do you track it and force change (and repercussions) to those that stray from the path? Do you hand-wave the whole thing?