I think there have been some nice improvements. HCA is better than the start of the new engine for sure, random stupid losses seem to be down....I think D2 and D3 are just about perfect right now.
D1, which has the harshest critics, does have some problems with recruit generation and the mid-major/major balance that currently exists, but I am confident things will get fixed. It just might take some time. But other than D1 recruit generation, I really don't have much to complain about. But that IS a big issue right now that is hurting the D1 game.