I did a shit ton of work on this a few years back. Annoyingly, this is an area still largely seen as objective rather than subjective by companies. Just had a quick look and when the system was upgraded for the Olympics (2011), measurements were taken based on the Speech Transmission Index (STI) and the space was rated 0.51 (0 = shit, 1 = excellent), which amazingly hits the target for spaces of that type (big spaces with lots of natural reverberation). As long as they hit the numbers, I don't think it matters what it sounds like to you and me.
I was allowed in to do my own tests as part of my degree and measured clarity levels. The ideal C50 value in a large space is 4-6dB and the Ricoh came out at 1-2dB...
Interesting right?......Right? Hey, wake up!