Right from the start, and all through the map, defending is much too easy. I took me a few minutes to get past the first objective. And the defenders were probably yawning away as they spilled me and my team mates. The last objective is also one of the worst, although it's not as bad as the first. Getting into that transport is a real challenge.
Defense is just too easy there.
There's only one small door for the attackers to come through to get to the area, making it hard to avoid being fragged by the defenders. Definitely an above average assault map, Redemption is a lot of fun. Despite a huge balance problem, it's well worth the download. I imagine this was made for easy defense. In reply to your question about skill level, I was able to defend very easily with skilled, adept, and masterful bots.