Do keep in mind just because it's easy for some players doesn't mean it is for all players.
I've gone on Kanthea's and seen it steamrolled, and I've seen it result in TPK. Especially with those rangers now. Same with Swamp Barbarians, I've seen it cakewalked and I've seen it TPK people. It comes down to preparedness. Or skill level. And just because a quest is short doesn't make it easy. Slums tower and Mertois are extremely deadly, and in most cases it either takes 15 minutes or everyone dies. They have two extremes. Same with Wizards Chess, it takes 10 minutes or it kills you.
Some quests that I think are to easy for anybody…
Tyche's Shrine
Lost Ring
Fine Establishment.
Something Under Foot (if you don't do optional, it's a breeze)
Bards Island
Jarneks. Easy. Boring. Crap reward.
Gypsy Healer isn't difficult, but it is very long, and that forces you to pace your spells/buffs. It can be hard if you exhaust to many resources to early.
Quests I refuse to do?
--Fishy spiders, the spawn points are insanely stupid here unless it's been fixed. Almost every spawn trigger use to drop MOBS in front and behind you, and all the high level poison DC's meant you burned a LOT of resources. Needs fixing if it hasn't been.
--The Stonelands goblin version of Waves Against Grain, I forget what it's called. Scales like crap. I've been on it with some OP parties and everytime the first 1-2 waves get smashed and then the party ends up in near TPK.
--Barrow (given by Dantin in CoF) - Unless it's been fixed, this could never be turned in. So you burned huge resources and got nothing. Plus, there was a secret door with a very high spot check meaning if you didn't have someone with max spot you got halfway through the quest and had to turn back. This is frustrating.