Pros:

-the chopper
-the music
-the upgrades
-SLOW MO
-skateboard
-weapons everywhere 
-laser sights
-the attic
-riot shield
-lots of MG's
-the guitar strap ladders
-healing stations 
-rewards for surviving a set amount of time 
-quarter gravity mode aka fly mode
-teleport's
-lots of defibs 
-the guys outside
-find the helicopter key 
-the angel at the stairs 
-instruments and mics play when shot at 
-climping up the guitar 

Cons:

-a glitch or two here and there can easily be over looked though 

Conclusion:

words can not describe how well thought out and done this map is i have nothing else to say besides go play this map.