Dobell, a senior CricInfo correspondent who has worked for the Times, Guardian and Wisden, said he had held back until England enjoyed a good day.
He wanted to make a stand for the good of cricket without being accused of sour grapes. Dobell added that he also had New Zealand nationality.
"I don't think England could have had a better day in terms of performance…in terms of results things could have gone slightly differently, " he said after day four, with the game meandering towards a draw.
"They (England) tried to force the pace on a pitch that is poor…if this is an entertainment product then that is a shocking pitch.
"People will say it's old fashioned test cricket, you can't moan about it…well there's no one here. If we want this sport to be viable, and if you take out the travelling England supporters, there's a couple of dozen people here today.
"That is not sustainable and the reason it's not sustainable is New Zealand is creating these pitches and they'll kill test cricket.
"They get results in the end like at Mt Maunganui…(but) a rock fall can be quite dramatic, it could be good TV, but a thousand years of erosion which caused it isn't good TV and I don't think the end justifies the terribly attritional means.
"I don't think this is conducive to modernity. People aren't watching this.
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"We love cricket, we do this for a living, we've seen a lot of test matches…these are very very dry, prosaic days and I don't think they are at all good for the game."
Dobell described the players as faultless.
"They couldn't have done more. Both sides. (England's double century maker) Joe Root's been brilliant but his skills have mainly been denial, discipline, concentration," he said.
"Are those things you turn on the TV for…let's not watch Joe Root drive let's watch Joe Root leave the ball and let's watch him nudge another single off his hips.
"That's all you can do on this slag heap of a wicket. It's very, very disappointing and I think it's a short sighted strategy from New Zealand.
"They've got five days of gate receipts. Great. I don't know how many people will fly 12,000 miles next time to watch this because it's not good entertainment.
"I've tried not to say it all tour, it's sort of building up to it. Basically, this is the worst series I've ever covered in my career in 20 years.
"You've got to be aware it is an entertainment product. It is so slow and they've got brilliant players on both sides. You just need to give them a canvas on which they can express themselves."