Soooo...I finally did remember to make a stop at a Starbucks to try the Pumpkin Spice things. I had a medium (Euro medium) Frappucchino with whipped cream (the unsweetened real deal) for 5€ (roughly the same in $ I was a bit shocked to realize *coughs*) and...weeeeeell, not impressed.
First few sips had a super bitter aftertaste and all in all it tasted like someone had tried to reverse engineer gingerbread spice (which is the most delicious thing ever), failling spectacularly. 0/10, won’t try again. ;) Seems I didn't miss anything.