I like the Heroes of Might & Magic series, but it has never been perfect. It's a very niche set of games that aren't quite role-playing titles or full-fledged strategy games. They are almost their own weird hybrid genre, and while I always applaud games for being their own thing, the Might & Magic series has become increasingly insular. If you played the last one, you will probably play the next one. If you haven't played them before, you probably don't know anything about them and chances are you won't play them tomorrow.
Lore and new campaigns aside, Shades of Darkness makes an attempt to be the "ideal way to discover the critically acclaimed gameplay of Might & Magic Heroes VI," according to its page on Steam. What it is more Might & Magic, and I don't think it's the best place to jump into this intimidating series.
Developed by professional outsourcing company Virtuos, this installment feels like a cookie-cutter entry in a series that has been growing stale to its fans for years. If you are looking for exactly the same gameplay and bugs as previous titles, then you are in for a treat.