We can all argue the rates until we die of old age, but I have to say that I do like the method.
Basically there is a plan for different amounts of data to fit virtually everyone's needs, and there is no data rate increase for tethering other than an overall $20/mo for the capability. I personally, at the expense of being thought of as a VZW fanboy, think the methodology is ingenious. Something for everybody with no "gouging" overage charges. My kind of plans.
If you didn't notice, the overage charges are very tolerable. If you go over a month it only costs you maybe an extra $10 over the price of the "next-up" plan to "learn your lesson" and to make adjustments in your plan if you see fit. This will totally prevent all those "Billion Dollar Bills" due to ignorance - or mistakes. Good move VZW!
It also strikes me that these new data plans are very much like the basic Nationwide Talk and Nationwide Talk/Text plans in methodology. They almost equate the DataPlan/TetheringPlan compared to Talk/TalkText Plan. Interesting. Similar concept on both voice plans and data plans. Much easier to understand, buy and monitor.
-Frank