I think it's too early to say if it's good or bad.
Look at SM, AcDc, Tron, Metallica, ST.these games have been there done that. While pins like Avengers, Transformers, Avatar, XM the same timeframe and we see which are the hits and which are the misses.
Munsters has been out for a minute, I don't think it's very good but heck I didn't think TWD was that great either but now I love it.
I can not say for certain that Munsters is destined to be middle type pin (B/C grade) but there is only so much room at the A/A+ grade pins (not every pin can be above average) and we all know that 10-12 B/W will never move out of the top 15 (MB, MM, TAF, TZ, AFM, IJ, etc.) same with Stern probably there is a big 5 already (LotR, Metallica etc.) so there will be a bit of judgment what will constitute A/A+ game. If Munsters settles down by RBION, Avatar, whatever in the middle of the pack that doesn't mean it's a bad pin. I think that it will be somewhat medium not the best not the worst.