Completely agree with the verdict on the 5H v2 headset. When I had a set for testing I just couldn't get used to the lack of bass and would go as far as to call them tinny. I tried to compensate with varied audio settings but they just couldn't manage it.
They were good in game in terms of clarity but when it comes to games like CS, if one was willing to sacrifice ace bass for accuracy they would opt for 5.1 headphones. They're slick and very handy for LAN as said. They struck me as a jack of all trades and a master of none.
Great review too, very difficult to describe sound quality as you did