Personally I really enjoyed playing DBZ:BT2 for Wii, despite not actually liking Dragonball Z. Looks like Atari is really making the 3rd one something special though with online play and all the problems the first game had fixed. Here is what Kotaku had to say on it:

http://kotaku.com/gaming/e307/dragon-ball-z-budokai-tenkaichi-3-hands-on-277832.php

You might recall that I really enjoyed Dragon Ball Z: Budokai Tenkaichi 2 for the Nintendo Wii back when it launched with the system last November. There were a few minor annoyances with the game, such as having to keep your Wiimote pointed at the screen at all times, but for the most part it was an excellent fighting Budokai Tenkaichi 3, and it looks to improve on the last game in nearly every way, while adding a first for DBZ console games...online play experience for the fledgling system, whether or not you like DBZ (I don't.) Here at E3 I managed to get some hands-on time with the next iteration of the series for the Wii, Dragon Ball Z:

Yes, the Wii does have an online component to it folks, and Atari is looking to prove it in a big way with Tenkaichi 3, which means that I won't have to settle for getting my ass handed to me by my nephew when there are so many other people out there ready to kick my butt into mountainsides again and again.

My main problem with the last game has been completely done away with, replacing the weird screen-in and out component for super moves with simple motion controls, which allow you to still look like a badass without looking like a badass with an unhealthy obsession with a little circle floating obtrusively in the middle of your screen. It felt very and fluid while still allowing for a range of motion wide enough to 'accidentally' smack your opponent in the face with your control should they start to win.

The rest is really more of what the fans of the series want. There are now over 150 characters to unlock via the relatively complex fusion system from the last title, with 30 fighting arenas to keep things fresh. The graphics look a bit sharper but overall there doesn't seem to be too much more in the way of tweaks, and honestly that's fine with me. My one major problem has been addressed, and the addition of online fighting is just icing on the cake, as long as it, you know...works. We'll find out for sure this holiday season! *keeps fingers crossed*

Another 3rd party online Wii title to be released this year (and one I'm personaly really looking forward to). The Wii version is the one to get, as it's the only one with online play and it has the great motion controls (gamecube controller optional if you are wierd and don't think it's fun to swing around your arms in fighting games lol). It took Nintendo a long time to get online dev kits in 3rd party developer hands, but it seems we are finally seeing the results. This is a must buy for me because of how much I enjoyed the first.

I actually liked how they did the moves in the last one. It took a little while to get use to (especially seeing the moves come in paragraph form) but once you get the hang of it, it was pretty cool. I'm curious to see how they improved those moves.

What I really hoped they fixed was the remote must be so close to the sensor bar thing. My couch was about 6 inches too far back so I either had to constantly move my couch back and forth or sit right on the edge of my cushions to play. Either way it annoyed the piss out of me.

I had actually planned on skipping this game but now seeing that it has online play I'll probably pick it up.  I'm not a huge DBZ fan but I've enjoyed all the Budokai games fighting system. 

"One big change here is that the game no longer relies on the sensor bar for input. Everything is now relative to the Wiimote's movement, meaning that you don't need to point at the screen with pin-point precision in order to do battle."

http://wii.ign.com/articles/804/804421p1.html

Seems like the sensor bar thing is fixed already.. that plus online, plus improved controls, plus more chars and it will be a must buy for me, haven't played a DBZ game since cube. I just hope Bra (or Bura, vegeta's daughter) is a playable char.

That's good. I really wanted to enjoy the last game I just couldn't because of the having to be so close to the sensor bar.

I love dbz but i coudln't stand playing DBZ:BT2 for Wii. compared to "let's TV: dragonball" 1 and 2, the wii controls for it was much harder. the let's tv version basically has 2 rings you wear senses your motion such as a punch, kamehameha, or swiping away enemy's attacks. but i think i'll gotta try the BT3 for wii first. :)

Dragonball is shaping up nicely with the last 2 Wii titles. Most Anime games are bland. (See endless Naruto 3d brawlers.) I might get budokai 3(thought of getting 2, but now i'll wait.)  Only other Anime game i'm probably getting is Victorious Boxers (Hajime No Ippo).