In the EU, there are offerings such as 5GB of data for $25, but they are prepaid and you can't buy additional traffic. (and also limited to 7.2-14.4MBit/s, or in other words the EUian equivalent to Sprint, where people complain that it's too slow)
Comparable to Verizon would be Vodafone - the new Vodafone RED plan for $100/mo. is with 3GB data included and unlimited voice. Makes your AT&T plan look like a bargain?
There are offerings such as 30GB of (LTE) data for $110/mo, but they are data only.
You can however have plans with 2GB included, which can be reset to zero for $7.50, which would calc out to $3.75/GB. Pretty cheap, right? (unless you think in terms that this what it costs you to watch two episodes of comedians in cars getting coffee or whatever you're fancying).
And don't forget that you have unlimited 4G on T-Mobile and Sprint - there is no such offering in the whole EU.
I call a little BS on this, the US landscape seems more expensive, but in reality, it isn't.