This, Strike Team Hydra, and Galaxy of Pen and Paper are all 4 star games according to this site. I like Strike Team Hydra plenty well and really appreciate how accessible its developer is, but putting it on the same tier with Darkest Dungeon shows a failure of PT to quantify real differences between games. Sure, DD is hard enough to not appeal to everyone, but its level of polish, balance, voice acting, and thematic and mechanical unity put it on a tier above either of these other games. Is it perfect? No. But in its current form it beats the pants off many other 4 star RPGs in the store, and there's still room for interface improvements. Easily 5 stars.
I'm sure Michael can elaborate more on his thoughts if he wants to, but there's a fallacy in assuming that just because three games have a certain score, they are all the "same". To be honest, this is the main weakness in top-level scoring systems like the one PT uses.
I prefer it over scoring out of 10, I think, and definitely find it better than scoring out of 100, but at the end of the day boiling down the question "Is this game good?" to a number is never going to really hold up in the long term, especially when you start comparing one game to another. It can only act as top-level guidance.
You also have to consider that Michael wrote the STH review as well as this one, but Mark wrote the Galaxy of Pen & Paper review. While we have a rough scoring guide on our site, there's still room to manoeuvre there as everyone is different, everyone expresses their opinions differently and everyone has different sets of values.
As much as I've seen people say that they use the scores as a quick-stop guide to looking at whether or not a game's worth buying, from my point of you if all you're doing is looking at the score then you're doing it wrong (and I mean no offence to anyone here, but we accompany scores with text for a reason). As long as you read the text, you'll know what that 4 means and know how it truly fit with the other games you've got in your buying queue.