I have made a search and no such thread, so here goes.
OKTs - can't live with them but also cannnot live without them (in the cheonging context of course). They can sometimes make or break our bonking adventure and we all have our favourite ones and at the opposite end, most disliked okts in geylang.
As they are part of the service industry, we as consumers, i feel we have the right to list who we think are the best and worst ones in terms of service. We start with legal houses only cos this is not FL Dome and we don't have to name names, just the Lor and House no. will do.
my 5 cents

Lor6H52 This guy will greet you and entertain most of your questions without showing impatience.

WH54 Went to check out his gals and got a mouthful of !X*@X#? for not calling any of them.
this is from my limited experience in GL but i appreciate more bros with their vast experience can contribute. Thank you.