The Teleports map can be improved by addressing one key issue: removing the landing point on the island (in the original version, it's a map glitch that allows you to land on the island without destroying the teleport).
Regarding Slugfest, you need to be very careful – play it only if both players understand what they're doing. Otherwise, you'll end up with something like: "Let's play a quick game..." and the result won't be a real rating, but...