I don't mind the batcave, for strange reasons that involved my wife bribing my son to switch bedrooms we bought it at the weekend as well.
But much like the Assult on Hoth set it just isn't complete and overall struggles to justify the price tag. The figures are fun, the car great, but after that it just isn't a 220 set, also like you say, there just isn't a major fan base. The one off car they did at SDCC was great and justifiable, but a full set and a roughly finished one at that seems miss judged, almost like Lego just feel they can flog anything, like they are untouchable.
I like the Assult on Hoth, otherwise it wouldn't have bought it and as a play set I think it works well, like you say it was fun to watch my son play with it and add his figures to it etc. But it is being sold as an UCS at top dollar, the blurb describes it as iconic and the very zenith of Hoth sets, yet we have seen all but an inaccurate generator and ion cannon before.
When you look at the last few UCS we see Slave 1, Sandcrawler, Tie-Fighter, even the Ewok Village, these are all complete and stunning to look at, not to mention challenging builds, the Assult on Hoth set took a couple of hours to build and most of it my kids did, again not UCS standards.
The big issue was the marketing, packaging and branding, this should have been a 170 system set and then people would have be all over it.
One of my worries is we might be seeing a trend here, lower quality and a growing arrogance from Lego that us fans will just lap up whatever they throw at us. We are already hearing the planned UCS Snowspeeder has been pulled for this year, leaving us with a Death Star at the end of the year, not much known there but the roumor is it is an update of the recently retired one but I guarantee it will be more expensive, will the updated figures justify it, is a it a major overhaul, who knows?