I am a .hack fan, and have played through the first 3 out of 4 of the original games (Quarantine is expensive and rare) and have played through G.U. twice. I've also seen the //SIGN anime all the way through, and have the .hack//G.U. Trilogy movie (which was amazingly good). I have too many .hack books to mention, and it is INDISPUTABLY my favorite series of all time.
Plus, Azure Flame Kite is awesome. Best looking blades ever, with a name to reflect their epicness: Empty Skies.
Well, I hope you have enjoyed my advertising, I am sure you will find .hack a fantastic series if you give it a try, and CyberConnect 2 should hire me, especially since this is probably the sixth time I've made this speech.