A few weeks ago, I returned to the game to see what was up. I rolled a new character, and by level 30 I realized one thing.
Some mobs are completely unreasonable for leveling, while others are a very obvious choice. Allow me to give an example. Gruok do quite a bit of damage, have a nasty bleed, in contrast with any sort of beetle which is quite a safe kill. I remember, in my mid 20's i was killing level 35-40 frost beetles with ease, simply because I would buff my weapon for fire damage, and smack them for 200% damage. The fights were about as difficult as a normal ulmus beetle my level, however, many times more rewarding.
In a different experience, I was with a druid and I was on my crossbowman. When we hit level 35, we decided to try the level 56-60 Ice beetles, since the frost beetles were proving to be unchallenging. At this point I had all points dumped into crossbow and dex, and he had all points dumped into nature and focus so we could land as much as possible on these much higher leveled mobs. I would pull, and use all of my abilities while running away from it since its still at a distance. At which point, he would throw his fastest casting stuns/roots on it, going from fastest to slowest for obvious reasons. If a plain Root spell landed, I would gain a bit of distance, sit there and wait for both of our cooldowns to be over. Then we would repeat until it died. We got to mid 50s from our 30s in very short time (in comparison to what the normal speed would be), experiencing only several deaths.
I quickly got bored of this. I remember as a noobie back a few years ago, I really enjoyed all of interesting mobs to keep leveling interesting. Now, it's ruined due to my discovery of the invalidity of a lot of monsters due to the entire beetle experience.
My suggestion, nerf beetles (more specifically, frost/nix/ice/snow beetles) AND the skulk hunters while you're at it.
As an added note, I feel like its unfair the dragons only have to level one ADV school to 100 while bipeds have to level several schools to 100 to get a similar effect.