I have zero clue what GHK AKs you lot are using or what you have done to them but mine has been superb from the moment I got it. Yes, the auto sear needs replaced cos it will break, but beyond that mine is hitting 60m no problems, it out ranges my stock MWS.
You don't need to mod maglips, that just causes jams. Jams are usually the result of bad quality BBs or the guide tabs on the nozzle being damaged, shave them off and all is fine again. In fact, mine hasn't had guide tabs for the majority of time I have ran it and its still chugging along.
The Maple Leaf chamber is really good but needs careful installation.
There are a few niggles with them but generally they come through people not knowing what they are doing. The mags are excellent and in 3+ years of owning mine I have not had a single leak.
Parts issue? Rubbish - readily available from Samoon or Milspec and magazine rebuild kits from Lees Precision. The only part that really needs replaced is the auto sear for a steel one.
They are much much much better than WE AKs. Sorry, as much as I like Negative Airsoft he is just plain wrong on this occasion.
If you want a someone to talk you through GHK AKs PM me as I am very good with them