Dungeons & Dragons Chronicles Of Mystara holds up well. Even today.
The graphics aren't high definition, but still sharp enough and are definitely an improvement over the original graphics, thanks to our high resolution monitors.
Like the original games; the gameplay is all about beating creatures up, while collecting money, gear and finding secrets. Basically a beat 'em up with light RPG elements. You can pick one of the many available classes. All of them come with their own armor and moves. A nice and great idea back then, but when you compare it to (action) RPGs of today it's, obviously, disappointing. Especially when you can customize pretty much anything these days, from the looks of your character to your own playstyle by selecting the specific skills *you* want to use. I agree it's an unfair comparison, but I couldn't help but notice it, because the game is linear and short, and the current asking price is steep for what you actually get. There are so many other games out there, for the same price, or even lower, that give you much, much more value for your money.
Anyway, the developers have also added challenges to the games. Kill 10 enemies for example and you'll earn in-game currency that you can spend in the virtual store to buy artwork and magazine pages, as well as things that can help you beat the game like making your items unbreakable. It's a fun idea that I'd love to see appear in other 'modern retro' games. It does give the game some replay value.
As I mentioned the game is short. This is thanks to the unlimited continues. There's no penalty for dying. So beating these games in approximately 2 hours, well, that's pretty fast. And the other available classes aren't all that different to warrant a second playthrough, but I guess you could give the drop-in/drop-out co-op a try though. Or I could see you play it again to complete some more of the challenges.
To make a long story short; buy it if it's cheap (because it is a fun game), but for the current asking price (€15) it's just not worth it.