Actually, it's hard to guess what value got the server.
You cannot tell without an rcon, am I right? Or maybe there is a way to check it even on public serv?
I prefer cl_updaterate 103. My game changed totally when I stopped using 100 and changed to 103. Every bullet goes to head and it seems I don't have any recoil at all. I suggest you to try cl_updaterate 103 if you want to start owning all internet games.