This games does Dynasty Warriors gameplay better than any other title in the franchise. Taking the core gameplay that, lets admit it, hasn't changed since hte first Musou title (or Dynasty Warriors 2, as it were), DWG3 manages to make it exciting and new again. No longer can you rush the main camp (enemy HQ) and take out the boss, instead you have to work through a series of goals to even get him/her/it to appear.
These new mechanics make the game seem fresh, and the game lots of fun.
Unfortunately, the level design is likely the laziest ever seen in a DW title, and thats saying alot. I honestly think there are maybe 6 or 7 different levels that are all repeated over and over again with different areas holding different characteristics depending on the mission. At first this is nothing big, but after playing a few dozen missions, it gets extremely repetitive and quite annoying.
There's nothing wrong with reuse, but this got extremely ridiculous.
That said, however, its still good fun, and manages to be the most entertaining Gundam video game in the American market (if you're willing to look elsewhere and import, might I suggest ACE:R, an awesome crosover video game featuring Gundam, Macross, and more). Basically, if you like Dynasty Warriors and/or Gundam, then you should defintely give this game a go.
Personally, I don't see why a lot of people have a problem with this game. I have seen a lot of postings about how repetitive it is. I have played games like that before (Mega Man, Mega Man X), but they still are fun to play if you are a die hard fan. I have been a fan of the 00 series since I saw it. The graphics for this game are amazing, the gameplay is challenging, and the way you can mix and match as well as customize is an awesome perk. But I do have to admit that the story really doesn't have the spark that I like. Other then that, this game is in my top 10.