I know a lot of people (myself included) feel the IRNV is OP. I came across this post about it and thought I'd share:
Sadly they didn't say the "next" patch...only in a "future update" hopefully it will come sooner rather than later.
Karl Magnus Troedsson: Based on player feedback, we have made some tweaks to the IRNV scope to make it more balanced with the rest of the accessories in the game. The change is planned to go into a future update of Battlefield 3, and we will have more details on this update at a later date. In general, balance issues are always a hot topic for a game that attracts competitive players. We take all balance feedback very seriously, and we strive to make sure that when we make any change it is always an improvement to the overall game. This means being very careful when we make changes so we don't over react. Battlefield 3 is a living game, and we intend to support it with balance and technical updates.