how can a video on youtube look better as on your tv from the real source? maybe you watch the videos not in full screen? that could be the reason but why don't people watch youtube videos in the same full screen size as they play the games with? because then, the youtube videos look worse (or you have to play the games only on a smaller screen in the future they will also look better then^^)

depends on what exactly you watched. 1 car races and 8 car races look better than 12/16 car races or free roam because they use the photomode car models.
Also the mini games will run in 60FPS.

 Could you provide a link please.

Turn 10 said that there was no 60 fps at all.

Also I didnt think there was any 12 or 16 car races in Horizon.

It's from a leaked .zip folder.

Though you could still be right. While it includes render information of 12 and 16 car races, that doesn't necessarily mean that they are such races in the game. Maybe they just copy pasted them from Forza 4 :P

Also those mini games are capped at 60 FPS. Could be that they don't even reach those numbers though. But should definitely be higher than 30FPS.

As Crissindahouse said, I watched the videos in a small window, which together with the compression creates the illusion that there is more detail then there actually is. Especially with the off-screen footage.

There is nothing wrong with my tv, I play on a 1080p projector, 92" screen, carefully calibrated. It was disappointing mostly because the demo starts out with a very brown track with very heavy bloom. The lighting was a bit off too, it seemed that the lighter trees were glowing. Need for speed hp and Dirt 3 both had a better initial impression on me. The second race was looking better though.

Arcadey is not a bad thing, but I had expected a bit more punishment from driving into cars and guard rails. I misjudged a corner and bounced of the inside of a competitor and moved up 4 places in the pack.

I only had 20 minutes to play so far, and I can't wait to play some more because the driving is great. So it's doing that part right :) I'll switch the 360 to 720p this time and let the projector do the upscaling. That had cleaner results with Alan Wake. I'll get used to the graphics, it takes a little time when blowing 720p games up to that size.

yeah ok but if i watch a youtube video in 720p in full screen on my tv and do the same playing the game the game looks better. maybe it masks some bad stuff but it also kills all the good stuff^^  and if something in forza horizon is very good  it is anti-aliasing which in my opinion is one of the best i ever saw in a console game (from what i saw in the demo) so that can't be really the reason. that was always something i didn't like in forza but i really had no problems with it in the demo, even fine structures of a fence had no really bad aliasing problems.

if youtube looks better on the same screen and the same size as if i play the game, why don't i put my console on a machine which simulates this and can send the worse quality to my tv? then i have a better picture with lower quality! that will be the new revolution for nex gen consoles, an build-in quality destroyer to make the game look better

yes and if i get a machine simulating bad quality which like we now know is better as the real game, i have the best picture and with my brain telling me it is the best it will look like quality over 9000!

which is not hard if i know that the machine i have between my tv and the console is changing the good data in youtube quality data?

to end this now, here is the elephant in the room