Yep, it's incredible how some Pakistanis rage on about the S-400 more than the Indians...The intercept range is less than the stated 400km, that's the maximum range, and any system will never have a 100 accuracy ratio the same way through every Km, it's the same for air to air missiles.
Besides just where has there been a successful intercept of a major missile system by the S-400 in hostile conditions? There hasn't
How well did it to in Syria, the Israelis ran circles around it, the USAF tomahawks went clean through.
I know the Russians stated that the systems were not intended to defend Syrian infrastructure, but this seems more like a get out clause i.e. if they claimed it was switched on and couldn't take down US missiles it would have been a major embarrassment. It may be opinion based but I don't believe the Russians would have forgone an opportunity to down a US/Israeli missile, as the publicity generated would have been immense, with many nations wanting the system.