Played N3, if you like mindless button bashing, and pretty attacks youll like it, it can be frustrating as there is no in mission saving so fail and your doing the entire RSI inducing 20 min level again. As i said the orb attacks do look good and the later characters have varied styles of fighting which freshen up the gameplay. Story wise its pretty weak some nice cutscenes but the acting and lip syncing is terrible.
I liked it good to just chuck in and bash away whilst looking at the pretty colours.
Samurai warriors 2 is alot of fun - gets rid of all the crap from Dynasty warriors and keeps it fun. Its only a ps2 port like Dynasty but plays well and is worth a buy if you see it cheap or a rental.