I am not personally familiar with the Game Zero model mentioned above, but I have a bit too many Sennheiser headphones, and none of them bad. I mean seriously from HD201 to HD600/PCX550 - they all great phones at their prices.
Some reviews will point out some of the budget models clamping force too hard - these will loosen up with time.
I Had the same issue with HD558.
On the other hand open-back headphones, while providing typically higher fidelity, they also bad at sound insulation. For that, you should look at closed-back models.