Here's how I would rank the conferences, in order of quality - from best to worst:
1) Ubisoft (some very nice games were shown, and even though there was a bit too much forced humour, this had the best and least serious-business-type hosts).
2) Sony (content was just as interesting - if not more than - Ubisoft's, the hosts were decent but too formal).
3) Microsoft or EA (both had a pretty boring line-up - especially EA, but they had a few heavy-hitters that save it from falling behind Micro$oft; so I can't decide which one was worse).
4) Nintendo (a bit interesting at first, but got more & more boring as it went on - they didn't really show my type of games, most of them looked overly similar to me - ended up being an utter bore).