I see a lack of disapline, an over controlling wife. When he was 2 did he tell you what to do? He is a result of two people who created this problem. Its not too late, tell your wife to back off and trust your instincts. The kid is probably a normal kid!
Also read up on all the side effects. You may end up having to use 2 or 3 other drugs to deal with the side effects.
Ritilin is not a cure all and never will be. Perhaps it does work for some but I would think a very small percent.