That is an exaggeration, and I do not see what is the bad thing about many of the games being written in Unity either. Crusader Kings 2 and Europa Universalis

That is an exaggeration, and I do not see what is the bad thing about many of the games being written in Unity either. Crusader Kings 2 and Europa Universalis 4 run on Paradox's internal game engine which was ported to Linux due to Steam. I believe the same is also true for Serious Sam 3 from Croteam. And there is 4A Games who are making Metro: Last Light with their own game engine. I do not think Football manager 2014 will be using an engine like Unity either, but I do not play sports management games.