I wouldn't even say mixed. The reactions are negative. I think it's mixed between die-hard followers, but like I said, this is similar to the fan shock that people went through after The Phantom Menace. For the next week or so, fans are going to try and convince themselves that the finale was good - because they can't cope with it being awful.
Once the dust settles, I think it'll be unanimous that this was a pretty terrible finale.