Look, I respect your experience and opinion, and I believe in your account of Syrian equipment lacking in quality in the First Gulf War. This is something that is independently verifiable as well. I can see where you are coming from but I do have following contentions.
1. It is for the best to not take that S-200 vs. F-35 account seriously. There are too many loopholes in this account to be taken seriously. If this was real, Russia would have capitalized on this development to its advantage to maximum effect. These are the type of incidents that cannot be concealed for long.
Virtually no SAM system is a Fire-and-Forget munition in true sense. There is a reason why these munitions are programmed to take cues from the parent sensor system (command guidance), and some are programmed to take cues from multiple sensor systems (IMAD). F-35 is not absolutely invisible to some of the most powerful radar systems in the world but securing
a sustained lock on it from considerable distance sound fishy as well.
The F-35 will know that it is under lock and will illuminate the source of lock for the pilot to decide his course of action on immediate basis. You need to understand the 'situational awareness' aspect of F-35 while talking about this aircraft in general. The S-200 missile is also too massive to not kill a jet fighter at the point of contact irrespective of the warhead used (WE have been through this before).
Army says super advanced fighter wasn't damaged, should return to full service in the next few days
www.timesofisrael.com
A belated report about a bird strike on an F-35I has resulted in theories of an Israeli coverup being parroted around social media.
www.thedrive.com
2. In regards to condition of Syrian defenses in the present, situation is different now. Russians are there in Syria and providing all manner of assistance to them to make sure that Syrian A2/AD assets are operational and not short on munitions. Relevant statistics are rather surprising - over 1000 SAM expended - to engage Israeli jet fighters up to a period of time (Russians are really generous it seems).
3. Syrians are not the only ones to complain about Russian hardware; Armenians are also disappointed.
Now I do not take Russians for granted and I am sure that they are very powerful and dangerous entity. But up against NATO?