Sloppy Sludge, despite the name, is absolutely a top 10 best map for me. The rest of the tracks, notably Sweet Wonderland and Ironbed River are easy picks when they come up in vote, too.
The only real critiscism I have is that some of the tracks really show their age. Star has improved so fast as a mapper that some of the first maps released don't quite to stack up to some of the later ones.