Like moogirl45 said, Kensington Park is like the Sunken City. Even better, Kensington Park is the Sunken City of Marleybone. It is meant to test your skills for chance of high rewards. Enter at your own risk!!
It's tough, and it's hard to find groups that will do it. Fortunately, it's not a required (not a storyline) quest. It doesn't give much experience, and the boss drops aren't that great.
Not true. the last boss can drop the seraph pet, witch is really good with tons of great talents.
I forgot about the Seraph pet, probably because it's such a rare drop.
Its still a pain to go through the entire instance in the 5% or so hope that Stoker will drop the Seraph pet Then when you have the pet, you have to train it and hope that it will get the better talents.