Depends. I don’t care about it if it’s clearly stated just how much bandwidth you get. I’m not in the US but in Germany carriers will often tell you they have unlimited flatrate plans but also state that if you go above a certain bandwidth use you will be throttled to GPRS speeds. I have no problem with that. It depends on how clearly it’s communicated.

I can see how others may be misled by that marketing, though, so it’s no super great. No reason to get angry, just reason for concern. Some German carriers are much more upfront about that (they might say “1GB of data, throttled to GPRS speeds above that”) and I obviously prefer that kind of marketing. It’s less confusing and more honest.