M2:TW is quite a great game overall, and ushers in the look of the way a lot strategy games are going to start looking, i think ( RTS/Tactical and turn based hybrid).
The Gripes ? :
In the quest for more complexity and "balance", they broke a some of the battle mechanics that just "worked" in RTW. Charging is no longer as simple a matter as double clicking your target. There are convoluted undocumented instructions for getting a good charge off, but even so it just seems not to work as often as it does work. Theres either no penetration, or the charging unit just gets distracted by a shiny object 20 feet from the target and just starts walking. There are some general bugs/issues overall( distracting but not gamebreaking) with the AI in battles as well.
The AI on the turn based map is no GC2...its average at best , and deficient in a number of areas, especially diplomacy. The proliferation of new unit types on the turn based map can also make for maybe more unit micromanagement than RTW, which can be a good or bad thing depending on preference.
Buy it anyway ! :
All that being said, even with its flaws, its an awesome game. The battles are truly breathtaking. Each troop has its own individual look now, not just a clone of the others. They also sport a ton of individualized new animations, so zooming in on the battles is really rewarding, with scores of entirely unsynchronized troops engaing in dodges, parrys, and deathblows. The battle environments looks incredible...watching a hail of flaming arrows at dusk fly into the camera, lighting some troops on fire as they run around screaming is cool beyond description.
The scope of the game is truly impressive, as now the turn based component is approaching a game in its own right, in addition to the battlefield simulations which ARE a game on their own. There is a staggering number of historically based unit types to unlock with the handfuls of different nations you can play through the game with.
Based on the progress made and the direction that theyre going, I think the Next game in the Total War series, whatever it is, is going to be the best Strategy game ever. Now, if only they made something with spaceships and planetary invasions in the far future...