In my opinion there are a few thing that should make hunting monsters more interesting
1. Randomise spawning points
You simply can\'t camp when you never know, where the next monster will appear.
Also different monsters could appear in the same spot. So let\'s say you found an area with lots of rats. Nice. But suddenly a Gobble/Rogue/Fanatic/Tefusang/... appears and you would have to flee...

2. Amount of monsters should depend on amount of players in an area.
There have been times, when you run around in the sewers, (I\'m still to weak to hunt anywhere else...) where there are so many players, that it is hard to find something to kill. So why not letting spawn more rats and other stuff when more players are around and reduce the spawn rate when the number of players in this area decreases.
3. Randomise the strength of a monster
No I don\'t think there should be \"killer-rats\". But why not give monsters a kind of variation? So the Strength of a rat could be randomised between 10-20, the Strength of a Gobble vary from 25-45 (just choosing a few numbers to make myself clear

). Do the same with something like Defense or the amount of Hitpoints and you would get a wide range of monsters that are different to fight against.
Also the amount of experience you can get from fighting a monster could depend on it\'s stats.
4. create some \"events\" (not only against spawn camping)
Let\'s say the rats have had a nice time down in the sewers. They found a lot to eat and to few people killed and reduced their number. Now all of a sudden there are so many rats, that the whole sewers are crowded (or they even crawl out and try to find some more food in the city...). The players would have to gather their Strength and work together to reduce the number of rats back to a harmless one.
Or for the people who are more interested in mining: When there is a new area to be discovered there could be a massive huge stone that blocks a path to this area. Now everyone who has a pickaxe would have to work on this stone and after a (high) number of /dig commands the stone will become smaller and smaller until it is gone and the new area can be discovered. This can also be used to make an event inside of a mine where there is an accident and some players are trapped until others come to free them...
*getting more and more ideas for events so better stoped wrinting before I completely get off topic*
PS: please excuse me if I made spelling or grammar mistakes, as english is not my naural language