Hmmm I know digging up old threads is discouraged but my opinion hasn't been stated on this topic
My current favorite is the german Tomb Raider as it looks so nice
Favorite looking one of this year is the Ni No Kuni steelie, that thing is a true beauty
Other ones that I love the art on
- Naruto Ultimate Ninja Storm Limited Edition steel (US or ES release)
- Rage (both the inside and outside are gorgeous)
- Homefront (personally think this is very underrated b/c it's common, amazing art imo)
- Halo 4 FR Steelbook
- Hitman FR steelbook
- German/Austrian Army of two G1 steel
And so many more lol
*Worth noting I have no opinion on a steel until I actually own it