I'm not sure I understand. What is the reverb problem you're having? What games? And how do you mean best use of reverb?
Some games will use reverb to simulate being in a cave or what have you... but there's also effects you can add such as by using EAX Effects, but that will simulate the effects and IMO sounds like ***.
well in world of warcraft when i am under water the sound i really loud and its sound crakle a litte ind the sound and same issue in crysis 2 when im inside a building and the radar are scanning in multplayer