Dream Theater's one of my two favourite bands so was looking forward to this a lot. I think it is a good album but it is not one of my absolute favourites by them (unless it grows on me a lot).
Illumination Theory is great though. A brilliant ambient then orchestral part in the middle which does make it a strange song to listen to, but I find that it works and really enjoy listening to it.
No other songs really blew me away though. Behind The Veil probably a distant second favourite - amazing intro and solo. No song is bad though so it's a good listen, but Surrender To Reason, The Bigger Picture etc. don't really stand out as great songs too much - good, but not great. Was slightly disappointed with Surrender To Reason as I'd heard a lot of good things about it before the album was released, but it feels really disjointed, with some good parts and others that I don't like as much.