Same as Sacred, but with a few additions
Sacred Plus adds several nice additions to Sacred, which was already pretty good. For instance, it adds 'survival rating' to the character information screen, which basically shows you how long your character has survived (dying resets it back to zero). Supposedly, a high survival rating is somehow factored into the game's calculation for your chance of finding rare items. Items are also redone, so that their properties are now color-coded, making it easier on the eyes when you're studying an item's attributes.
Bugs...it's always bugs. For one thing, the path-finding can still be terribly bad at times. Case in point: in a dungeon, my character was able to walk around two tightly placed barrels, going in one direction. However, I wasn't able to retrace my footsteps in the other direction, so I was stuck, and had to reload. More bugs include quest givers that will sometimes stop speaking, so that you cannot complete your quest, and enemies that are sometimes spawned in the walls (which can be good, since they're totally inaccessible, and can't hurt you).
The Bottom Line
A hybrid action/RPG hack-n-slash game that is similar to Diablo, but with much better graphics (in my opinion at least.) There are several nice touches, such as the random bits of humor, or the occasional Easter egg. And the fact that you can buy/sell/use horses makes it very nice. Replayability is average however, since the quests and the map is not random. You can only beat this game so many times before it starts getting tedious, regardless of which of the 6 characters you choose to play as.