When iPad 3 first came out people were rushing to buy the 4G models which the only carriers are Verizon and ATT. Neither one have an Unlimited Data plan so people were fast realizing that by streaming movies they were capping out the data plans and having to pay gobs of money just to watch a few movies.
Thanks to Sprint and their unlimited data plans I tether through my phone at 4G speeds and it's plenty fast for what I need. I even stream using hulu+ and it's awesome. I just finished streaming IP Man and IP Man 2 and I don't have to worry about capping out my data plan.