@takashichea: haveing watched only really the first 3 or 4 episodes of sword art online I am totally willing to discuss exactly its pitfalls in comparison to .hack XD
@takashichea: the obvious difference would be that while Sword Art Online involves thousands of people, .hack only involves select few.
I'll list more as I can
- While the chaos in SAO is caused by creator alone, the abnormality in .hack is cause by mysterious entity, creating programs that breaks all the rule of programming and real world
- .hack concentrate on game known as The World, but in SAO franchise the main characters move on to different game
- No offense, but SAO is more of harem series. .hack is more of... adolescence of teenager for lack of better terms.