I had this problem took a hire car (f30 330d) to Manchester around 300 miles, and felt very low, I did however come from my Qashqai but was most surprised when my dad got in it and couldn't hardly see over the dash.
It seems to have a ridiculous drop and not the same insane movement in the other direction.
However all this said in the dealer the other day i found the tilt! That makes a massive difference, if you get the seat all the way to the top then tilt the seat backwards, obviously moving the back to compensate i was able to feel quite a bit higher in the seat.
Hence why i brought it LOL!