I also thought of giving Dark Depths a 3/5, nevertheless I cannot ignore that it's still awesome. The visuals, especially the ones in the boss fight, were fantastic and the bomb idea was cool. These are mainly the reasons why I preferred giving it a 4/5. A 3/5 would also make bad publicity to the entire campaign and I'd rather not do that just because there's a rotten apple in the whole bag. In addition, I'm pretty sure you won't leave that map unupdated for long, otherwise I would've set it to needs fix without having second thoughts. Don't let me regret my decision!
As for Solen's Sanctuary (the best map among the 4 in my opinion), you'd need to talk to Ardenian. It would be unfair intervening even if I have the permission to do so as a moderator. As for my own personal views, it's still a 4/5. A bugless map doesn't necessarily mean a 5/5. The map could still be more exciting at its beginning just as it is at its ending. My impression on the map wasn't that positive until I opened the demonic gate and was on my way to Solen.
Still, it's up to Ardenian to decide. If he gives it a 5/5, it'll be more than fine for me. Try asking him