I really enjoyed these Games, first on TV and then flying to Seoul and spending five days there.
Mascot: a very good one, not as facetious as Hero the Hedgehog but very present at all venues, and interacting with the public
Transportation: well organized, regular and dense Olympic bus network. Maybe a bit too specialized so that you had to change like four-five times to go from your hotel in Gangneung - if you could find one - to the mountain venues. The regular city bus network was free, but had limited working hours, was not working late so if coming from a late hockey match the final item of your daily routine could be a very long walk. Otherwise the taxis (alternate solution) were relatively cheap and could drop and pick you quite close to the Gangneung Olympic park North and South Gates. The KTX was the most convenient transport from Gangneung to the mountain venues (Jinbu train station), I finally found out. Not free like in Sochi, but relatively inexpensive and fast (about 20 min between Gangneung and Jinbu) compared to the Sochi - Adler - Krasnaya Polyana railway.
Gangneung Olympic Park: Four venues, all brand new except curling plus a stadium which could have hosted the ceremonies without problem (why ?). Special mention for the toilets with brand new white soap bars every morning (Korean do not like soap dispensers ??). The blue plastic seats in the venues were reasonably comfortable. Seat and gate numbering was sometimes confusing, since there were often gates closer to your seat than the one indicated on your ticket. Pretty boring house of Tokyo 2020. Access to House of Beijing 2022 needing to perform on line registration three days in advance and provide your passport #. I hope it does not announce the modus operandi for these Games... Nice food and ambiance at House of Canada. Packed full superstore and McDonald's as usual.
PyeongChang Olympic Park: larger than the Gangneung one, but without real venue, only the stadium, the Medal plaza, shops, exhibits and restaurants. A bit sad and too large for its function. I am sorry that the figure skating medals are no longer given in the venue but are now on the plaza like the other sports. When you have attended a figure skating competition, you are not going to drop everything to do a 3 hour trip to PyeongChang for the medal ceremony.
Connected : free wifi in all venues, was working very well, even the outdoor ones. Maybe a bit distracting for some younger spectators. Saw a lot looking their iPhone or posting on social networks instead of actually watching the athletes... For some reason you had to switch off/reset the iPhone when going to another venue, the phone was not recognizing the wifi from a second venue when you had connected to a first one beforehand.
Attendance : most of the venues where I went (hockey, speed skating, short track, figure skating, nordic skiing) where packed full. Alpine skiing (giant M) was half full as well as bobsled for 2. I suspect that the arenas were fuller during the second week than during the first week. Mostly Korean people in Gangneung, with a small contingent of Europeans, Canadians, Russians and Japanese. More foreign people in the mountain venues I felt.
Other amenities: Loved the distribution of free heater packs and free flags from your home country. Unfortunately French flags were given out before I arrived. Food at the venues was ok but un-Korean : tuna sandwiches, sausages, hot dogs, nachos with cheese, etc.
Volunteers : for me the highlight of the Games, always smiling, always helpful, I would have like to hug each of them individually, but they were far too many. And of course they survived thanks to the heaters pack they constantly had in their hands. Their mastering of English was sometimes limited but then Google translate is your friend.
Security : ok but not invasive, no military guys everywhere, like in Sochi. Lots of very young policemen and women. Waiting time are security control was short. All the Olympic Park in Gangneung was in the same security perimeter.
Overall I would put them from my spectator experience at the level of SLC. Not out of this world like Lillehammer but better than Torino for sure. Sochi is a special case for me because as a spectator it was wonderful, but there is the context, these Games nearly killed the Winter olympics. Also a factor to consider is that due to better health and higher salary available I could go to more events (up to three a day) than in Sochi or Torino.
As said by others, congratulations to Korea and to the volunteers for excellent Games, indeed Games as they should always be. I have been following Korean bids on GamesBids since the first one for the 2010 Games and it was a great satisfaction to see them delivered so well.