Pros:

=Upgrade system=
-Unique features to promote constant upgrades
(ex. Teleporter burns you and has a 10% incap rate if your base isn't upgraded to 2)
- Tunnel event makes it fun and challenging.
-Defensive wall that can be used offensely as well.
(You can be up on the wall and snipe or you can hide near your base)

Cons:

Not sure its a con for everyone, but it's challenging.

Conclusion:

This is an awesome map that is unique in its design and features. Builds team work and reminds me of the flash game Defend the castle :P