This has already happened before. As I have expected, the results weren't really great but it certainly managed to win it's games at the lower end.
Worth noting that, first, not all of my ladder games were AI ones. Though right now the non-AI ones already expired (I started using it against ProcloManfredi); and second, I only blindly pressed Run and Commit on Wunderwaffe, never using other bots and never moving anything.
Essentially it gives you a solid victory spree with 0 effort early on the ladder due to it's smart picking, BUT eventually just solid picking won't work; the lack of counterplaying around your intel (you might know all your enemy's picks; wunderwaffe just pretends it doesn't), coupled with the rather weird attempts at breaking bonuses and extremely easy predictability once you figure out it's an AI, and your ELO starts to drop.
Notice how, at a point, I started having just about the same numbers of wins and losses, then eventually I got a loss streak of 5. At that point, boredom and wunderwaffe's elo stabilizing sufficed for me to just drop the ladder. It was fun.
Wunderwaff-ing my way in the ladder got me Not Ranked with a rating of 1383.