Pros:

Greatest L4d map EVER!
...
Scratch that, greatest Video game add-on ever created!
Amazing.
I just cannot express how awesome it is.

Cons:

The only Con I can think of is that the NPC's (i.e. Gandalf, Legolas don't move)  Even better is you could reskin the players to be the characters from the movie.  That would would make this the highlight of my life.

Conclusion:

Sick map bro!
I'd like to see it made into a campaign mode.  You could find out how many zombies you killed!

Pros:

A decently sized map, Chargers are hilarious to watch when they're on ice.  All the slippery physics seem to work on player and zombie alike.  It's a good twist to fighting zombies.

Cons:

  Not enough features.  It's a rink with stands all around, and changing room and an announcers booth.  But that's it.  Maybe more music?  a Parking lot of sorts?  Any extra content on this map would do it good.  The lighting seems a tad bright in areas.

Conclusion:

A decent map that I think has some very good potential if more areas or other content is added.