I'm also firmly of the belief that rules should simulate the genre conventions accurately. It's also trivial to make new professions or let the players design their own.
Social class plays an important role in initial skills, also, something missed by all of the others.
One of the best task resolutions around. The only disadvantage, really, is that it's currently out of print, awaiting a revision as part of the Rolemaster Standard System. The down side to this revision is that currently Cyberspace is a very simplified version of full Rolemaster, and as an RMSS supplement, it'll take a massive leap up the learning curve. I love this game. See my detailed review for more information.