Today, I was reviewing the game engines and below are few most interesting (masterpieces really) clips I found. Overall, I find Unreal Engine to be the best, but also cost prohibitive and Unity 3D to be pretty much industry standard, total cost about $4,500 (pro, iOS & Android).
http://www.youtube.com/watch?v=lhoYLp8CtXI
http://www.youtube.com/watch?v=CXBTcg3WeM8
http://www.youtube.com/watch?v=MOvfn1p92_8
http://www.youtube.com/watch?v=IsIqZVnidGw
https://www.youtube.com/watch?v=W9qQRoew2do
http://www.youtube.com/watch?v=IsIqZVnidGw
https://www.youtube.com/watch?v=W9qQRoew2do
A nice comparison of game engines can be found here.