What exactly has changed for the worse, in your eyes? Simply saying "it's worse now pls fix" isn't particularly helpful for TD.
AI has definitely come a long way from the original. I think the Rookies and Averages are still maybe a bit too good on the gunnery side, and the AI being able to instantly snap out of a flat spin (even in the P-39
) may still need some work if possible. It's still a far cry from them accelerating away and spiral climbing to space, however.