There are too many events that simply spam waves of mobs at you with seemingly zero HP scaling. Thus you get this competitive tagging mess of 20 weak mobs spawning and instantly being mowed down by aoe to get loot, repeat this for 5 minutes or so and that pretty much sums up 90% of events.
On top of this tougher mobs (Champ/Vet) aren’t nearly as rewarding for the time and effort it takes to kill them.
My suggestion is a fairly simple one and can kill two birds with one stone. Have Champion and Veteran mobs count as multiple mob kills in terms of loot dropping. Basically you kill a Veteran Mob and it drops 2-3 regular mobs worth of loot, while Champion mobs can drop 5+. Suddenly they are actually rewarding and worth the time to kill instead of being compelled to skip them.
To take this a little further, since there are many different levels of diffculty for Champion and Veteran mobs you could give them a star rating based on said difficulty that also corresponds with their loot drops. (Some veteran mobs actually take awhile to kill while others don’t, and there are Champ mobs that are pretty easy/quick as well).
A very rough example :
1 Star Vet/Champ – 1.5x/3x loot
2 Star Vet/Champ – 2x/4x loot
3 Star Vet/Champ – 2.5x/5x loot
4 Star Vet/Champ – 3x/6x loot
5 Star Vet/Champ – 3.5x/7x loot
Now, back to the events. What you can now do to fix this tagging mess, while also making events more fun, difficult and varied, is do what you did to the Bridge Event in Kessex Hills.
Instead of massive waves of centaurs being spawned to be farmed at the bridge event, now only 2 centaur workers spawn at a time, while tough Veteran Mobs spawn to fight the players, if even more players show up a Champion Mob actually spawns, and then Catapults are actually sieging the players.
This is much better than just throwing waves of mobs at players, and with the rewards increased on Champ/Vet mobs it can still be good loot. Of course this doesn’t mean mob zergs can go away completely, but a good balance of tough boss mobs and moderately sized packs of mobs to flank players would be great.
This would eliminate alot of the difficulties of tagging as well. Of course another good band aid fix would to actually give regular mobs some hp scaling in zergs. =p