Emulator

if you notice in the background where you see black lines, it looks broken

do you have a comparative screenshoot ?

Also you need to put your config (CPU,Video and drivers);

Enabling "emulate format changes" should fix that black line problem...

my video card is an ati radeon HD 2400 256mb
and my cpu is a core 2 dual core 2.13 ghz
and here is another screen shot notice the box how the geometry is broken and when i get closer to it, it gets better. also emulate format changes doesn't fix the problem

i have the latest ati driver and also, there is a big slow down in pianna park, and i can't ever get 60fps in this whole game, i can only get 30fps even when the speed is at 100%. this problem is also in new super mario bros wii when you use direct3d9, i put a screen shot

it does happens on quite a few games (the ones i remember are megaman 9 and 10, dead rising and like i said, quite a few)

also d3d9 seems to be slower than d3d11 on a few games as well (example, the naruto's)

Your graphics card is kind of outdated. D3D9 should be the best graphics plugin for Windows. I'm using an ATI Radeon HD 5770 and D3D9 is still the best choice for me (D3D11 gives me some lag spikes).

nope, d3d0 has a little flaws as i said, it works a lil slower and somegames DOES have a lesser quiality (try megaman 9) best pluggin and fastest one for windows is D3D11 (it works flawless)
But it seems this is depending for the person as baagel.noogan seems to have the same flaws i have for d3d9 :p (so it's inverted)

I get the same problem as the SMS screenshot above with the diagonal stripes: there's tons of Z-fighting and other problems that one would normally expect if the near-plane and far-plane settings are screwed up (too far apart or too close to the camera), and these problems only happen with the dx9 plugin (looks fine on opengl with the same video card).

People that don't see these problems probably don't see them because their video card has a high enough Z-buffer depth to hide the problem, but since the problem shows up only on dx9, that still means that the dx9 plugin is doing something logically wrong here that the other plugins are doing right.

Here, I made a screenshot of identical frames in DX9 and OGL. It's interesting to flip between them and see how different they are:

http://img233.imageshack.us/img233/5614/dx9.png
http://img291.imageshack.us/img291/3090/oglb.png

Try disabling Catalyst A.I. in the CCC, that thing is known to cause problems like this in D3D9.

Disabling Catalyst A.I. had no effect for me. However, if I remove FOURCC_DF16 from the DepthFormats list in D3DBase.cpp, the quality suddenly gets better... at the expense of breaking Z buffer peeks.

Disabling the A.I. fixed the problem for me. But cannt get 60fps on this game

Seems like you're using a very old version of the Catalyst btw, you should try updating, also Catalyst AI (a.k.a hacks) should be set to "Standard".

it should be set to off, coz its junk.

Erm, so what problem is this issue report anyway? You've named like three different issues now, all which seem unrelated, which is quite tempting to mark this report as invalid...