Good news is that the game seems very stable - not a single CTD. Other than things, mostly minor, that I reported in another thread, I really didn't notice many glaring problems.
The AI, though, and the final result, trouble me.
Throughout 1861 & 1862, the Union AI was quiet ... [see main beta Patch thread]. In 1863, it seemed to come alive - savage fighting in Kentucky, where my Army of Tennessee was pushed back from Louisville to Bowling Green and finally all the way to Nashville. We pounded each other in northern Virginia, as well. After that, in '64 & '65, there was nothing really going on ... 2 major forays into Texas with large forces ended with the AI taking Houston. I retook all of Kentucky and crossed the river to hold and create depots all along the river. The AI protested a bit. I assaulted Washington with 3 corps of the Army of Northern Virginia but was repulsed by a huge Union Army there. Other than that, the AI seemed pre-occupied with Harpers Ferry/Winchester area and little else. Except for the loss of Houston, I took the entire south, including Kentucky and most of Missouri.
My morale kept falling.

Throughout the game, there were NO Mississippi River incursions by the AI [Memphis, Vicksburg, New Orleans], NO attempts to take North Carolina, nothing at all in any of the deep South. Minor stuff at times in Arkansas.
Other than what I described, the AI seemed to be content to sit and build huge forces, which it did quite effectively. However, they did very little with these forces on the offensive. Since I play a pretty defensive game as the South, it made for a dull - mostly - 5 years.
The AI needs to be held to the fire ... at least based on this one campaign! It was more active - and surprising - in 1.15!