A complete newbie to .hack in all it's forms I went into this with no expectations aside from a few recommendations from friends after finishing up Log Horizon some time ago. I will also say this is my first ever real OVA experience which makes me a bit jarred by the necessities of storytelling in that medium.
I will say overall I enjoyed Quantum, a fun little, if dramatic and heartfelt journey that may not have left me with any real impression of whether or not I wish to continue with the franchise as a whole but certainly leaving me with a lot of enjoyment for this tale at least.
Another problem I had is I really had no sense of what things were or how they operated, there are many times that mechanics of the game or technology go unexplained though I am almost positive this would be solved for me if I were to watch some more major entries in the franchise like Sign that would have a bit more time to devote to such things.
Overall I enjoyed this one, not sure if Sign should go up on my list though. Oh well.