It has it's bugs but overall its an excellent game.
You see, behind all the glamour and glory there are a few annoying technical issues. There are a numerous amount of bugs, including archers firing at your own troops backs if they stand a bit too close and irritating things such as your own men not moving when you command them to. Do not worry though, bugs such as the last one do not happen very often at all. But its things like this that stop Barbarian Invasion from becoming the magnificent game that it could of been.
However, if you ignore these and just play the game you will see how fun it can really be. It's a must have for Total War fans. Even if you own Rome Total War and thought 'Yeah it was pretty good' then i recommend it.
If you desire more of the intense, remarkable and incredible gameplay that we got from Rome:TW then the Barbarian Invasion expansion pack is the answer!