While I do agree that the first unibody MBPs were greatly ahead of the competition in terms of build quality and usability, they never aimed to compete with the very top end of the market in terms of specs. Configuring a Windows machine to be more powerful than a high-end MBP has always been possible at any given time.Yes there was - Apple was ahead in 2010 when the unibody MBP came out.
If anything, the MBP has never been as close to the top as with the current model (GPU performance aside, that is). If there's something we gradually lost over the years, that is build quality and long-term reliability, and more in general the "premium" feel that the MBP once carried down to its smallest details, not hardware power.
The MBP has always tried to be the best "jack of all trades" premium laptop in the market, nothing more and nothing less.