What are Your Favorite and Most hated Record Manufacturers

Analogue Productions can produce some very fine records. So does RTI Unfortunately, the sister company, QRP, will press all variations of quality. It seems the QRP sticker on the jacket indicates they actually cared enough to do it right. Records with the "Pressed by Pallas" sticker tend to be very clean and quiet, more so than RTI pressings in some cases.

As you're sure to know Mike, I am tempted to say none, because pressing is such a crapshoot. But then thinking about it some more, I have no idea who is good in terms of new or current production. Historically however, which to a certain extent carries on to this day (to the extent, if any, they are still pressing!) the good ones are:Reference Recordings 
AudioQuest 
Sheffield 

These are the only ones with consistently high quality. In my experience.  AudioQuest label is not well known but they did a series with great blues men like Doug MacLeod and Sam McClain featuring all high end AudioQuest cabling in the recording chain.

Sheffield has consistently superb recording quality and flawless pressings. Michael Ruff Speaking in Melodies is a true desert island LP.

As for the worst not even the internet has room to list them all.

With respect to companies still pressing LPs, I've had generally good experience with Acoustic Sounds, Mofi and Analogphonic.  Generally bad luck with Yarlung Records.

Bear Family (Germany), Sundazed, Harmonia Mundi (France and U.S.A.), Ace (UK). 

rshak, Acoustic Sounds is Analog Productions. MC, Reference Recordings is still going strong and making great product but the others are sadly extinct. Yes John, Ryco is now owned by Warner which is more than likely the problem. I forgot about Sundazed. I'm pretty sure all my Sundazed records are high quality. Bear Family is a store specializing in Pre Beatles music. They do not make records.  Yarlung is very small doing only craft music. MoFi does OK for the most part.
Oh and MC go to Analog Productions and buy the record by Janis Ian, Breaking Silence. I promise this record will give you a new standard for recording quality never mind the 11 great tunes and her voice. 

Mike