The same argument appears in iPhone contract comparisons. The interesting thing, is that the individuals who complain have no idea how much actual data they are using. That typical usage? Somewhere around 80MB/month. So, that plan that provides 2-3GB/month? For all intents and purposes, that's "unlimited".
The same goes for broadband. Find out how much traffic you are currently using, ask yourself, "is my usage average?", and then make the comparison.