Pros:

- Great Wall!
- Awesome winter environment
- Variety of paths
- Creative idea for the finale

Cons:

- Finale is broken. It's riddled with problems, ranging from bugs to poor balance
- Very short campaign unless you get stuck

Conclusion:

My team had great fun until we got to the finale, which was completely broken and ruined it for us.

- Couldn't leave: after completing all objectives on several different tries, we could never get the rescue boat to leave. Had to end by quitting the campaign.
- Buggy ice: sometimes it would melt, sometimes it wouldn't. My team was being as precise as possible with the boxes, but it still sometimes didn't work.
- Infinite tanks + infinite hordes + slippery ice: too much. Keep the slippery ice because it's unique, but make the tanks/hordes alternate rather than keep spamming constantly. Spam isn't fun. It's challenging enough with all the slipping, it doesn't need neverending respawns.