We seem to have 2 or 3 issues here:
1) Detail: I don't see how anyone can complain; there is clearly more detail in the BD than the SD versions. It's not like the first release of the 5th Element, which used mpeg2 with too little disk space, this is a high bitrate AVC encoding. The movie simply will never look like Crank, and that's a GOOD THING.
2) Color Timing: This is obviously subjective. I like the creepier atmosphere of the BD, but I can see how others would prefer the DVD color timing.
2.5) Black levels (clearly related to the color timing): A lot of people seem to be most disturbed by the change in black levels in the movie. Since Coppola approved it, it's again fine by me (and mostly responsible for the "creepier" feeling I get from this version) but I can certainly see why some would prefer to see more details. Also, there do appear to be occasional artifacts from the black-crush process. Too bad these movies aren't all mastered in 12 or 16 bit color depth, but it's the reality we are stuck with. I can't imagine noticing those artifacts at 24fps, but that's just me.
Conclusion: There are a couple of reasons why people may not like this transfer, but they seem to have FFC to blame, not SPE or the encoding artists. I cannot imagine that there is significantly more detail to be had form this movie, so people complaining about that are doing so out of unrealistic expectations, or a lack of perspective.
I want to say that this is not like many earlier BD releases and some more recent HD DVD catalog releases, where QC seems to have been the problem (Disney's Dinosaur jumps readily to mind), there was every bit of technology, space, and bandwidth available. The detail from the original is there, it's just a soft-focus movie that was composited optically. In many ways similar to Sleepy Hollow, which has heavy grain and is shot soft-focus in smoke-filled interiors; Warner has been bad-mouthed over how SH looks, but in point of fact it's a good representation of the original.