I keep going back to the police station to get yet another cleansing the commonwealth mission from Reys. How many of these missions are there? I did over 10 of them already!

They infinite/repeatable.

Theres always another hole for those abominations to crawl out of.

Now get to it soldier!

Unlimited missions. They had to do it that way since there is no max level.

They're radiant quest. Always repeatable and utterly random. A simple formula of "go to dungeon x and clear/retrieve y".

They're good to pick up to if you need extra caps, if you're happening to go that direction anyway because of an actual quest, possibly discover a new location, or if you're just out of things to do.

They plague this game, whether that is a good thing or not.

If only it would hint that it's never ending... put it under some [repeatable] tab in your quest-log. Same for the settlement problems that keep popping up or those quests from the other factions.

I've been doing the M.I.L.A. (spelling?) quest for the Railroad three times before I realized it's just one of those repeatable quest. I honestly thought it was needed to find the location of the Institute.

http://www.gamesas.com/topic/1559826-how-to-stop-endless-quests-for-minutemans-48-lvl/

Yeah each faction has those repetable quests which doesnt bother me but they should def mark em under special tab like miscelanius quests in your pip boy to prevent confuzion