the demo board/review tools seem to be severly lacking
i'm not sure how big of a deal this is for most, but a lot of the functionality that KGS has for reviewing games and looking over them with other people seems to be completley missing in OGS.

the second biggest gripe i have is that it doesn't seem very straightforward usage wise, but that can improve over time i suppose.

it makes me wonder how useful review tools are to most go servers usercount.

Judging by Tygem and wbaduk, not much correlation between usercount and good review tools.

Do the reviewing tools for Asian servers improve if you use the non English clients?

I can only comment on the Japanese clients for Tygem and wbaduk, and they're the same as the English variants.