According to a friend of mine that has been attending fosdem for a few years now, the main track is always crap but the true gold is in side tracks and topic-specific assemblies
I don't think it's generally fair to say the main track is crap. But the logistics of the event are such that it generally makes sense to mostly pick a devroom and hang out there.
It's just an insane amount of talks with enough good ones to make it worthwhile, plus the important hallway track. Nothing special about any particular track except maybe that, historically, Postgres has always had a few really good ones IMO.
