Well.. it's the comparison that 10 made. People just follow up from it. If I promise you a 5-course gourmet dinner and then bring out a bag from Maccas, you might still enjoy it for what it is but would give me dirty look and go around calling me an idiot for serving Maccas as gourmet food.
Reactions would have been quite different if 10 said that they're redefine the show for a modern audience. Then people might not have invested their time in the first place. Or might have casually followed it along and enjoyed it for what it is. Or would not have wasted their time with it at all if they are not into that type of entertainment.
But they called it Big Brother and set expectations. They called it the OG version and set even more expectations. It's on them if they don't fulfill these expectations, not the viewers.
So does everyone you complain about here. That's why people post here. They want the show to be the best it can so that it sticks around for as long as possible.
You said that 10 was brave to take the show back. I wouldn't call it brave, I'd call it smart. I don't think that was a chance that the first reboot season would have failed. Big Brother is a goldmine, because it has a rare thing: It has a passionate community that will always come back for the show. They might not stick around for the show, if they don't get what they expect from it - as proven by the version that aired on 7.
And that community will always be passionate about their show. And that's a good thing, even for people like you who take whatever comes towards them. Because without those passionate people, the show would be where Australia's Next Topmodel, The Mole, The Biggest Loser or Beauty and the Geek are.. in the TV graveyard and definitely not revived for the 3rd time.
Besides, show me one person on this board that has just been complaining and not giving credit when the show has done something right.