Dissapointing performance

how many doctors do you go to when you're sick? its not rocket science, these guys(who have helped me directly or indirectly) many times are all telling you the same thing. this thread is like an accident on the side of the road, you just cant help but look!
Well doctor is doctor. But I dont know who here is expert and who isnt. And engine is complex thing in deepest level. Sure basics are easy to understand.