I'm generally finding that the new difficulty ratings are more realistic. Yes, I still have trouble with some "Easy" ones (usually before coffee), and I still breeze through a few "Difficult" ones (usually after coffee), but for the most part the ratings are jibing with how hard the quote was.
Here is a great example of the new ratings being correct. This is a long quote I just solved that used to be ranked as "Easy" and that was upgraded last week to "Difficult." It was brutal, even though it was long, and the stats reflect this, and now so does the difficulty rating:
"Poker is to cards and games what jazz is to music. It's this great American thing, born and bred here. We dig it because everybody can play."
You solved this cryptogram in 76 seconds. That's worth 437 points!
This Cryptogram's Statistics:
Success Rate: 10.2%
Average Time: 176 seconds
Record Time: 29 seconds (nanrich)
This quote used to award no more than 149 points, and now it awards up to 449 points. I'd say that's much more realistic.