First off I've no idea who is giving this film high scores but their reviews seem to indicate they've not actually seen the film.
We have regular 'cinema nights' with the kids (6 and 10) and when Dogtanian came up on Sky Cinema I thought it would be right down our street as I loved the animation as a child.
First off, this film is 1hr45 long, longer than Frozen yet or needed a good 45-50 mins shaved off as it has so many pointless bits which don't add anything other than boring bulk.
The voice acting is awful, you can literally feel the actors struggling to read the script, adding pauses in strange places and mispronouncing words. The story is over complicated for children, quite boring and dull. There's a fart joke 5 minutes in and I'd argue that it was the peak of the film.
The animation is awful, so low budget, it's clear they spent all the money on the rights to a beloved cartoon and had little left. It looks like it was made on an old movie maker package on a 20 year old PC. There are two camera angles and that's your lot. It looks horrible (though the line art 'flashback' was nice and served only to show how rubbish the rest of the film was). It was so poor it distracted from what plot there was.
We turned the film off before the end, I have to admit it. I'm SO disappointed my favourite cartoon as a child has become this. The kids were FINE with us turning it off which I think says it all.
Save your time and watch the old cartoons on YouTube or just watch a different film altogether.