DOA 4 is possibly the best DOA game ever. Thank you Itagaki!
Anywho, where do I start about this game? The gameplay has not been changed much since DOAU, but there is one noticeable difference - it is much faster. This makes the game extremely good and very entertaining. Though I did find one problem - with the faster pace, the online gets hit - lag can sometimes jump so high, it sometimes isnt even worth playing. But the fun crushes that bad out, so it still is awesome
The graphics.. well, They are gorgeous! The arenas are beautiful, and so are the character models. The sound was awesome, but not wuite as good - during fights, sometimes Jan Lee's "Watchaaa!" can get annoying :P
The difficulty is hard.. unless you're uber good, and the learning curve , well, depends on what character you're playing and if you've played DOA before. Jann Lee, for instance, could be mastered very quickly, but Ayane (the best character EVER) on the other hand, takes a while to fully understand
The value, as I state, is vey good - the computer always offers a good challenge, and if thats not enough, go online and try beating some SS guys!
So thats my review.. hope some people agree with me on my rating..