The Dev who made Doom 3 said the Gamecube woud run it just fine power wise. It just didn't have the storage capacity. Gamecube mini-dvds only held 1.25 GB of data. That was the only limiting factor for Doom 3 on the Gamecube.

The Gamecube not getting certain games wasn't because it "couldn't" play them. 99% of the time it was because the effort to port it properly to the GC hardware was more espensive than the forseable profit.

The fact still remains as has been said dozens of time. The best technically ever achieved on the xbox was 12 million polygons at 30 FPS. Best on the GC was 20 million at 60 FPS.

Those God of War 2 and GT4 pictures aren't screenshots, those are target renders. The actual games never looked that good.

unfortunately the Dreamcast didnt lived too much to get some good engines. But i like these games graphix:
Virtua Tennis 2:


Jet Set/Grind Radio:


Ecco the Dolphin


Test Drive Le Mans


And, obviously, Shenmue 1 & 2

I'm very sure the xbox was capable of doing the best. Just look up specs really.

This! The Xbox was the most powerful spec wise. I will also agree that Rouge Squadron did push the most polygons last gen but it doesn't make the GameCube more powerful. But I enjoyed all four systems last gen and don't really go by all that. It's the games that matter! The Dreamcast was the most played system by me last gen.

Holy crap really? That's damn surprising since it died some what fast. I believe the ps2 was my most played last gen next to the gamecube, which is pretty average. 

Ah, my friend, let me introduce you to a phrase known as "cutscene graphics". You see, in cutscenes a lot of games(especially those made by Square Enix) used a different set of modals and environment textures that they can't actuall use while the game is playing normal.

See this face for Yuna in FFX-2

Now see the one of her standard character modal while you are playing the game. The square hair, the pointy nose, the eyes, the flat mouth ...just the hole face is far lower in quality. Her arms are much more blocky. And the biggest thing of all(even though you can't see it) in the top screenshot, she has 5 fingers.

The modal on the left is the one you see most of the time in the game. You never actually play with the one on the right.

Them breasts...

I imported Dreamcast games from japan until 2007. I also have over 300 Dreamcast titles. Actually import isn't the right term Ebay would be lmao.

I'm sorry but the Xbox was without a doubt the most powerful and it showed. Although GC could put really beautiful games it couldn't handle the best Xbox could offer. Framerates was better and jaggies were less apparent on Xbox. Also there was some particles effects not possible on other platforms and some blur effects. Everything was so smooth and like someone said they could output at a higher resolution.

Only on Xbox could you get graphics like these

Project Gotham 2

Rallisports Challenge 2

Black

Ninja Gaiden Black

Kakuto Chojin

Conquer Live and Reloaded

Chronicles of Riddick

Some of the geometry on Xbox games weren't even possible on other platforms, games like Splinter Cell Chaos Theory had landscapes different from both GC and PS2 because they weren't powerful enough. Some lightning found in games like Doom, SC, Riddick couldn't be found in competitors games. Every multiplat games were far better on Xbox. There were impressive games like F-Zero GX on GC but nothing that could surpass the best Xbox had to offer... damn I even remember games like Burnout 4 which were simply stunning (IGN gave a better graphic score for the PS2 version simply because it was impressive for a PS2 title eventhough it wasn't on par with the Xbox version).

I forgot about Kakuto Chojin it was easily the best looking fighter last gen but it ended up only average in the gameplay department.