I went into it in the 7700K review topic, but you should know that most of Anandtech's gaming benchmarks are basically worthless since they're all averages, and some are potentially GPU-bottlenecked too.
However you're right about lots of games not benefitting from >4 cores - especially if you're comparing to a 4c/8t CPU.
I posted a number of examples here.
Four
threads is definitely a bottleneck in some newer games today, but a hyperthreaded quad-core is often better for those games than having eight cores.
I do want more than four cores, because I actually have games/applications that will benefit from it, but I'm still very concerned about giving up performance in games that don't, since more cores generally means that your per-core performance is lower.