Lounge check-in is IMO one of the most overrated "perks" there is. I'd just rather check-in at the front desk and get to my room faster.
I had a lovely check-in experience when I visited MMQP. Front desk agent could not have been friendlier or more welcoming. That's why I suspect 3rdworldresident's check-in experience may have been aberrational. Otherwise I completely agree with his commentary on this property.