I'm guessing the normal cave is geared at groups, at 178 in reasonably good kit the standard cave is tough going if on your own compared to the brain.
In Scorps defense the last few events we have had people including myself have complained that there have been no group hunting caves and the server has been forced to go solo, now we have a cave that is trying to get people in to groups and people are still complaining!!
The exp is decent and drops ok if on pot etc (massive difference from moon) with the only minor niggle is being that some people apear to be getting an awful lot of book drops whereas others getting next to bugger all. I hvae pretty much lived in the brain when not in work since it launched and had 1x Cleanse, 1x Enraged whereas others in guild are opening up a library...
As a quick event not sure we could ask for much more, be really nice if we have another moon but not sure when the next one is due.