Pros:

An amazing map!!!

For those who think this is unplayable, enable developers counsle. Then press the ~  button at the main menu. Then type in: map arena. Then there you go! Your now playing it!

Like the whole desert looking, old arena setup.

Like the whole selection of guns and weapons.

Cons:

For the horde of infected, they all just stand up there, and it's not very possible to get them.

Infected are hard to shoot as they wonder around up above.

Conclusion:

Great map, just needs fixes. I think this has a chance of being one of the top maps if you fix some stuff.