Romans if you play with my bugfix mod. Being able to produce Civilians from Houses from the start of a match is crazy strong. Ptolemies also feels very strong due to cheaper buildings. I have read that most top-rated players judge Macedonians to be among the strongest Civs, but I don't fully understand why. 

Its a sign its boring to watch. Basically equivalent to hearing history lectures if your not into it. Well it happens to me to various gameplay videos a lot especially if it goes beyond 1 hour.

I do think it looks proportionally small compared to that farmstead. A person definitely have to duck to pass through the arch or to stand under the backside awning. With 0ad buildings, the first floor should look about 90% the correct height next to a civilian, while 2nd floors are only something like 60-70% height accurate. That's the "0ad proportions."

Oftentimes, watching 0 A.D. replays on YouTube knocks me out. Don't know why. 

When I ever do play any Playstation games my head also become hurt possibly from low frame rate, around 30fps, can also be motion sickness, or that your monitor has too much contrast/brightness the colour is tiring you, eye strain or could be anything really. Actually your fps is throttled both in menu and games, so increase it to 60, if you want precise use the scroll too. I think thats what causing you tired.