Oh, I agree, I personally do not find PES 2013 enjoyable anymore. It's more of an aesthetics issue than anything. However, I do not feel a new engine was necessary to fix the issues. PES 2011 had it right on, then 2012 then 2013 took a different turn and the ugly head of PES 2008-2010 stretched out in between the cracks.
I think the love of PES comes from an unconditional love. Right now, PES and I are broken up - but to say I'm not thinking of PES while I'm with FIFA would be a lie because I still have nostalgia of my first days with PES 4 on the PC, modifying option files and reducing the calves size of individual players to make it look more realistic.
I swear I'm over her...I mean PES