Perhaps because a lot of Bioware and WRPG fans are calling it a glorified or 'pretty' version of Baulders Gate? I don't want to stereotype, but many WRPG fans seem to think of themselves as savvy and 'hardcore' and so they might be put off by a game that looks like 'more of the same'. Especially a game that looks to be copying one of their favorite past WRPGs.
Its the exact opposite of JRPG fans who tend to like games which take a lot of past ideas and incorporate them into the future games. Note how I don't say 'copy', but use past ideas. Final Fantasy XIII is looking to be a perfect example of this.