May be I'm swimming against the tide but I have some serious issues with this show.
Not saying that it is a bad show and there were certainly elements which were very well done and some scenes were thrilling, heart warming, uplifting or gut wrenching but it is not perfect, far from it.
One of the biggest problem with the plot was the writer laid down rules that counters must obey while they are hunting evil spirits so that they have minimal impact on the human world. The problem is that the counters kept on breaking them because the bulk of the story is about them seeking revenge or meddling with societal issues. It got very awkward and painful to watch as they constantly tried to bend the rules or fix damages a la wiping people's memories and healing the wounded baddies. The writer ended up just throwing the rules away mid show by having the counters appeal to their handlers to let them have a free hand. It made half the show felt claustrophobic.
Another issue were the villains used. In the beginning of the show, school yard bullies were the main antagonists. It starts with typical bullying and extortion but it quickly escalated to attempted murders. Just remember these are technically minors. The Rules made all the counters' corrective actions meaningless. Those bullies were behaving worst than the thugs and gangsters used later on in the show without being possessed by evil spirits so why were they so nasty? It got real bad for the junior counter until the problem was pushed aside by his ultra rich benefactor. So all the special powers of the counters achieved nought but money and connections did. Consider how much the show was about money, corruptions and secrets, this was sending a very confused message.
Most shows have plot holes but this show have more than its fair share. For instance, after the counters were assumed killed, they closed their restaurant but continued to live openly inside. The thugs showed up once, rattled the door a few times and said no one is here so they must really be dead. Geez, anyone could have chance upon them for the longest time. Similarly, the level 4 evil spirit was being chased by the police as a mass murder and his face was on TV and posters everywhere. However, once they faked his death and the police made the announcement, everyone seemed to forget he existed. He was walking around everywhere without any disguise. Why didn't anyone noticed? There are a number of other holes or subplots that went nowhere.
The effect of these problems made the middle section of the show seemed adrift and suffer from some kind of identity crisis. All the characters were there and there were great fight scenes, more death and destructions and the odd funny subplots but it doesn't feel like it had much to do with the original uncanny counters concept (aka super heroes vs evil spirits). Maybe uncanny eco-warriors, uncanny thieves? They expended so much energy setting up the central theme and yet it was underused for a good half of the show.
There was also a writer change after 12th episodes. The standard "creative difference" reason was given. There was definitely a change in the plot and tone with the last few episodes. The bulk of the last episode was very much sugar overload with resolution of plots and closures for all main characters and even a MiB style makeover for the team.
Generally speaking, the acting were good. The junior counter probably had the most growth but then again, he was stuck in self pity mode for half the show so it was expected. The found family trope was well used and there were good warmth between the fab four. There was little romance, certainly nothing more than wishful thinking.
OST was good, I probably won't rewatch it as the problems would annoy me even more on a rewatch.