I like it! Chiba-san's singing sounds very natural. She doesn't try to make her songs something that they're not. It may seem like that is the common thing, but I don't think so. Too many seiyuu songs sound like they're trying to be far more than they really are. On a negative side though, none of these songs may have the impact to get on someone's best-of list.
By the way, I like track three a lot, not because it's a great song or anything like that, but because it's entertaining. Sometimes, that's all it takes.
