I just did the PQ on my lvl 210 NL, and it was rather disappointing to say the least. To start with, it was rather tedious as it was 2 stages of "kill 180 mobs in this very spread out map with only half-decent spawn rate" then 1 stage with a "boss" another kill 180 mob stage, and then a last ms boss. Two of the maps have more than one level of platforms, which makes it incredibly hard for any class without vertical mobility to get an S rank (pretty impossible, even if you one shot the mobs tbh). To top it off, even after finishing the PQ with 3 A ranks and 2 S ranks, I earned all of 0.18% exp (counting what I got from killing the mobs).
Everyone knows that grinding after level 200 is a huge pain, and it gets exponentially worse after level 210. To try to combat this, I propose that the minimum level requirement of Alien Visitors is changed to level 210. In addition, I think that the mob exp should be buffed accordingly, and the completion exp should be increased 10 fold (literally, just add a 0 onto the end of it). As it stands right now, it takes someone ~10 minutes to finish the PQ, and at level 210 they gain less than 0.2% exp. I think that at the very least we could buff this to almost rewarding 2% exp. After all, the number of entries are limited, and with the exponential exp curve after level 200 it won't replace grinding for very long.