If I'm really honest, I wouldn't entirely agree with you. Chaos Bikers can be some of the most hard hitting assault troops when you use them well. I've seen them used with brilliant efficiency. I would agree that Berzerkers make better assault troops. But, when Bikers are armed with Power Weapons, that, coupled with the +1 to Strength when turbo boosting makes them pretty tough too.Best tactics for chaos bikers, Don't take them.
They are overpriced for what they can do, the specialist troops in rhinos are generally far better, berserkers and noise marines are better assault troops, PMs are more durable and 1k sons are more shooty.
If you do take them, MoN is probably the best to take with a couple of melta guns to go tank popping