I was a bit worried about this release due to how bad E:TW was compaired to the previous instalments. However, I bit the bullet and bought it. Only played for a day but so far seems far better than E:TW, while the single player campaign has been critisized a bit by reviews I like it, you get a very small map (e.g northern Italy, Egypt and part of the Mediterranean) with normal victory conditions (i.e. control these provinces and hold x many in total), if you liked the historical background info in the previous total wars, you'll enjoy following napoleon from childhood (tutorial) through his various victories.
(Note: Below is taken from playing a small part so far, but is compaired to equal ammount of time in other total wars)
Pros:
Not a complete lagfest/waiting half an hour between turns as in E:TW
Units 'replenish' in friendly towns (with a sufficient barracks) with upgrades available to increase rate.
Units suffer lossses from attrition, through the desert and being in cold climate, (can chage depending on time of year)
Time scale is now 1/2 month per turn (makes movement and single turn actions more time realistic)
'Story mode' tells the player about what napoleons goals and hurdles where in a particualr theatre.
Same fun gameplay from E:TW
Time constraints in 'story mode' mean you cannot just sit and build a massieve zurg rush army, or even take over every thing in your way, it may be better to negotiate for military access than to start a war (never came across this in any of the others, just steamrolled through anything in my way)
Cons:
Cant play as minor factions only france / one of the coalition, (a few more in MP but all major european (or Ottoman empire) countries)
Judging by the way 'story mode' panned out it doesnt seem to have much replayability.
Misc:
Map is smaller (no americas etc), personally I like this but its personal prefrence, makes sense considering where Napoleon had influence.
Generals can a.Be recruited anywhere (including travel costs

) b.Will be multiple starred General with existing traits.
Napoleon cannot be killed just 'knocked unconsious and returned to his pokeball' to be fine within a couple of turns at your capital. (can be used to have a strong unit that can be sent into suicide missions, or to transport him faster than normal)
Once ive got a far bit into the mastery of europe bit (main open world campaign) i'll post back.
Judgement so far:
Better than E:TW
Not as good as M2:TW (think melee weaponary works better imo)
No-where near as good as R:TW