Laugh! Laugh at the inferiority of the untermenschen-crafted weapon! 
Featuring such golden comment chains as:
One a/c on the assembly line. Look at manufacturing sites for F-35 and F-22. Dozens of aircraft lined up. That’s the difference.
That’s the first thing I noticed. Russian industrial capacity has literally collapsed, I never realized they were this weak. Compare that to their Chinese allies who have been able to produce an impressive number of J20s pretty fast even though the SU57 had its test flight earlier
Too many people stealing money and limiting their capabilities. Good lol*
*not like our trustworthy Raytheons and Northrop-Grummans, of course 
Dudes citing promotional photographs from the single first unit being built in as though that's indicative of the actual machining throughput.
Dudes acting like the F-35 contracts weren't signed almost 15 years before the Su-57's with a design document complete in 1996 as the supposedly ready to enter service X-35 design that was unusable (which they inexplicably built and flew despite knowing it would never work purely for the delivery money while trying to figure out some way to completely change every aspect of the plane while making it look similar enough to fool Congress.) It then took several complete overhauls and a decade to get to a first-flight as an entirely new plane, only to need an additional 4 major complete overhauls, and is getting yet another overhaul to maybe hopefully let it operate in the wind or rain.
The Su-57 project started in fucking 2008 and got a first-flight less than 2 years later. They didn't get any purchase orders til 2019 and have been producing units with a skeleton crew while under sanctions and having virtually everyone on the project actively servicing and retrofitting other planes that are currently winning a hot war while spending $100 billion less than the west has spent on that war.
Same energy as when redditors find a picture taken in 2004 of a run down Khrushchevka in a half abandoned mining town and use it as evidence that the Soviet Union/Russia is one giant slum
The F-35s were made for profit and have a distributed supply chain over a dozen countries so they need the sales first to keep the contractors paid and happy and their factories running, even if it means there are major defects that may or may not be fixed in the future.
The Su-57s were designed and built as a handful of prototypes intended for rigorous testing to work out all the kinks before even starting a serial production on it. The process takes longer but you have a more or less robust aircraft by the time serial production begins and have far less defects and flaws to worry about.
Very different mentality here.