I do love a good engine once it gets going and can admire it, but I don't like pointless engines that don't do anything! We're all guilty of sometimes building (or trying to) an over convoluted "engine", and beginners can of course be culpable of "village idiot" syndrome; village, village, draw three villages, village, gain village! This happened to me today and was pretty infuriating when your turn is play a bunch of money, province- 2 seconds, wait an age, repeat.
But in general, a brilliant engine is a thing of beauty to behold- no matter whose it is! (though obviously aggravating if cashes in one turn before you!)