If you've played the original games, the nostalgia will punch you right in the mouth. The lackluster unit pathfinding, the building limits, the weird hit detection, all of it has been unchanged - but that's what makes it great. It's a graphical touch up that allows you to play the games as they were without getting a headache staring at low-res, blurry graphics.
The biggest tragedy here is the cut scenes are often terrible quality as they were unable to recover the original video files, but for if you're a fan of the series and want much better looking and sounding gameplay at a good price this is an easy buy. Just be prepared to have those keyboard throwing moments when the pathfinding decides to send Tanya right into the path of a tesla coil.