To each their own man. You are talking as if Viv averages 30, while others average 50. Viv is not statistically better than the likes of Tendulkar or Lara, but then he isn't really inferior to them either (other than in runs scored - which is obviously a result of them playing much more cricket than Viv).
I have no issues if someone opines that Tendulkar or Lara were better batsmen than Viv, however to claim that they are miles ahead of Viv, or that Viv was nothing but theatrics is honestly laughable.
Viv was way ahead of his time. Nobody batted like that in that era. In that era, just nobody tried to hit fast bowlers back over their heads in Test match cricket - as often as Viv did. He was one batsman who you could safely say would be successful - if you time-transported him just as he was at his peak in 1980 - to practically any era, in any format of cricket. There are very few batsmen about whom you could say that. For example - many batsmen of Viv's era - if they were time-transported as they were at their peak back then to today's 20-20 era, they would have struggled to cope with the demands of scoring at hectic pace in 20-20.
And similarly if modern day greats were transported back to mid-1970s for example (with those equipment and those rules), they too would not be very comfortable say facing Lillee and Thomson in Test cricket with no helmets, minimal padding, and very little restrictions on bouncers. At the very least, it would definitely affect their attacking approach.
It isn't just Chappell, the list of cricketers who rated Viv as the best batsman they have seen is pretty impressive. It includes Brian Lara, Barry Richards, Ian Botham, Imran Khan, Michael Holding, Andy Roberts, Jeff Thomson, Martin Crowe, Aravinda De Silva, Mohammed Azharuddin, Ravi Shastri, Javed Miandad, Ramiz Raja, Inzamam Ul Haq among many others.
The impact that Viv's batting had - when seen live - was something else, especially in the era that he played in. Is Viv the unquestionable all-time #2? Definitely NOT for me. Is he in the conversation for top 5 batsmen of all time? For sure he is (as are Hobbs, Sobers, Lara, Tendulkar and a few others).