I haven't seen anything yet, like a few others have, so I have no idea what it'll be like. But I do think it'll be good enough and that they're putting a good chunk of effort into it. Because:
Source: IMDbDirector Uwe Boll contacted Blizzard about directing the film, but Blizzard refused. As quoted by MTV news Uwe Boll stated: "I got in contact with Paul Sams of Blizzard, and he said, 'We will not sell the movie rights, not to you... especially not to you. Because it's such a big online game success, maybe a bad movie would destroy that ongoing income, what the company has with it."