A lot of us are switching over to Millenicom due to price, higher data limit, and the benefit of using the Verizon network. Millenicom is a reseller of Verizon, AT&T and Sprint data services. On the Verizon side, anywhere you can get a Verizon data connection, you can get a Millenicom data connection. Millenicom does not offer any phone plans, only data plans. Plus, NO TAXES and NO CONTRACT! When you sign up for the 69.99 Verizon MiFi plan, you pay 69.99 total!
Back to the OP's question... I am not sure how much data is transferred during gaming sessions, but I would sure be very careful when using any provider's plan because of the possibility of exceeding the data limits. I do know two people that love their games AND they love Netflix. Both of them have purchased TWO Verizon data plans from Millenicom, giving them each 40 GB of bandwidth a month.