Watched a couple of episodes and agree with the consensus - it's pretty great! Amusing, sweet and more importantly a love letter to Japanese arcades of the 90's. I'm not normally a fan of GCI animation but it works quite well here.
Was a little peeved they used TubroGrafx in the subs instead of PC Engine though, especially since they had a visual joke that only worked with the latter. And it's clearly written on the front of it.
I've not read it but I believe the original manga includes more references to SNK games, but they ran in to legal issues. Shame, seems like really good, free advertising...