Never understood why the 365s are so popular among enthusiasts. Not fitting air-con was an oversight when they were new, and the high-density seating since they were last refurbished is reminiscent of the ancient old coaches used for school trips when I was a kid.
The modified front ends with the toothless grin looks absolutely pug-ugly too.
I agree the front end is a little ugly, but that's not of any consequence in the grand scheme of things.
Likewise agreed the interior isn't as nice as it was (the original scheme and layout was excellent, probably one of the best ever for a suburban train), however judging by the fact that commuters tend to fill the airline seats just as quickly as tables I'd suggest your views on the seating layout aren't shared my most, although personally I prefer tables. Weekends are a different matter when the relative lack of tables can cause squabbles when groups are travelling - but nowadays these trains are very much a commuter train.
Apart from that they're comfortable and spacious, and personally I prefer the opening windows as at least one isn't at the complete whim of the HVAC system. They're also toasty warm in winter thanks to a very effective heating system.
The 365s are also pretty reliable - I think the issues in Scotland were more to do with the fleet having been sent up there in a massive rush (understatement!), with no opportunity for depots and operating staff to gain experience on them. Certainly their performance on GN has always been excellent, particularly so given that up until last May they were being totally thrashed with a very intensive duty cycle, not helped with units often being out of use thanks to level crossing prangs on the Kings Lynn section.
Although most on here would probably identify as enthusiast to a greater or lesser extent, I think you'll find that most of the comments stem from people who *use* them on a regular or daily basis, so this isn't just enthusiast frothing. Indeed from an enthusiast point of view one could say they're quite bland.