Morpheous: These are
review scores, not user votes. The game has averaged 93% in published reviews. And we're not talking some fly-by-night review sites, either - both GameSpy and IGN gave it Editors' Choice awards. It's not Half-Life, but it's a big accomplishment for a game team which has never numbered more than ten artists and developers combined.
I would personally quibble with top 10 overall - that's going to change depending on what review sites your statistics favour. However,
MetaCritic has it in the top 50, along with games such as Splinter Cell, Baldur's Gate, Thief, Age of Empires II and Neverwinter Nights.