Actually it made things worse IMO. The display is a LP***** one (that is, LG), so it is eligible to that color profile. However, it actually increases contrast which is a bad thing when watching videos (shadows become a plain black). I prefer to preserve dynamic range instead of increase saturation and contrast.
The MBA display is not better than the average TN display found in Samsung plasticrappy ultrabooks. The good news is it's not worse, and of course not the worst. I have the impression that my late-2009 Macbook and the classic MBP I saw in the store have better viewing angles, although they have a lower resolution.
The 2015 MBA is good for people looking for the best battery life in the market with an "office" workstation. It's not for photo geeks, but it's a very nice machine for other uses.