I have played up through part of act 3, and I can easily say that the game is good, and if you enjoy rpg's you should by it. The game isn't great, as of yet, I haven't finished the game yet, but it is very good now that the patches have been released. I have had no major problems, like the game crashing or anything. My biggest complaint with the game was the inventory system, but now that that is fixed, I don't have any big complaints. Personally I like the voices, and I like the fact that they gave everyone a voice. I especially like the voice of the billboard. It is classic Larian. And while the game is too difficult during the first act if you play on tactical or higher, once you get to the second act and beyond the fighting is managable. The gameplay is very similar to Divinity, so if you liked it you will like Beyond Divinity's game play. The skill system is nothing special, they could have left it the same, but I think it is slightly better, and I am glad they experimented with it. With a few tweaks it could be really good for Divinity 2. I think the coolest addition to this game, from the original are the spells. The spells look tremendous, and there a such a wide variety to cast. It was also a good addition to up the intelligence of the various monsters. They work together, and many different techniques are needed to defeat them. That makes the game harder, but in my opinion better. Right now by biggest gripe with the game is that most all of the quests are straight forward kill some monsters and bring back an item. I was under the impression from reading previews, that there would be many more puzzles to solve in the game compared to Divinity, and maybe there still will be and I just haven't gotten to them yet.
Overall I would say definetly buy the game. I think many of the people who are complaining had unrealistic expectations of the game, and are remembering DD as better than it really was. The fisrt act of DD was very linear, hack and slash, not all that fun and really long, just like the first act in BD, but once you get past that the game is really good. So go buy it already.