It really depends on the child, because I completely disagree. As many times as I was told that 3 was going to be worse than two, I've sat back waiting for the bomb to go off. She's 3 1/2 and it hasn't gone off yet.
2 for us was absolute hell. I almost completely lost my sanity between 18 months and 3 years. I hardly left the house.
With a 3 1/2 year old, and 8 month old, we were able to go to Fridays for dinner, where they took forever with our food, and the kids behaved very well for the hour and a half we were stuck there. At 2 I never would have even tried that.