I've came home from many "movies in theaters" and thought wow that was an amazing movie and so great and ect, ect, ect.
Then when later thinking about it or seeing it on dvd or tv or whatever I think "how the hell did I ever like that movie"
for example, I loved Superman Returns when walking out of the theater. Now I cringe just thinking about that movie.
Lets not forget you have 100's of other people clapping nad cheering and it kind of makes one follow suit. Another example. I hated Anchorman when i walked out of the theater, now its one of my favorite movies. I think it sucked in theaters cause somehow was with a bad crowd. No one laughed like once during the entire movie. As said above, the experience then made me not laugh and thus not find it funny. NOw though I laugh all the time watching it and quote the movie quite frequently.
edit: should state not saying your point isn't valid. The downplaying of both conferances is ridiculous. I thought both were fun to watch minus the 20 minutes of talking that Sony had. Otherwise it was all fun great looking games. Sure maybe only 10% of shown games interest me, but still fun to watch.