As most people have probably noticed, valve decided to release the orangebox update a few weeks ago even tho it still really seems like a BETA.
There seem to be a lot of bugs & some huge gaping holes for scripting/hax possibilities which some already are exploiting.
The main problem at the moment seems to be interp/lerp.
After looking on various discussions and sites it seems that people with a lower interp can have an advantage, especially when peeking corners.
If you are quick enough you can shoot someone without actually being seen.
One thing which could fix this is the addition of zBlock to force cl_interp to 0.01 (as it was before the patch). But as zBlock doesn’t yet work on the orangebox update, everyone has free reign over the value and as a result often people with 100ms+ ping can gain a advantage.
Server admins can allow clients to put cl_interp down to 0.01 by adding this to their server cfg
//server interp
sv_client_min_interp_ratio “0″
sv_client_max_interp_ratio “1″
The clients can then disable interp_ratio and put interp down (we all disabled this the first time around)
//client interp
cl_interp “0.01″
cl_interp_ratio “0″
There are a few good additions to the patch but they are vastly outweighed by the way the netcode seems broke due to so many variables being open for clients to change.