Well, at least here (dunno about the rest of his posts) he doesn't trash consoles - he refers to Carmack's infamous "We don't consider PC leading platform for games", which didn't make PC gamers really happy and most of them are really bitter at JC now.
Yeah I'm not really happy with JC at all(not that it matters, who am I? xD) and it's because consoles to ME are not the leading platform, UNLESS we're talking about sales. I'm just not really used to the age of gaming where a company can boast about selling 20million copies(call of duty) even though the game is a rehash/repackage of what got them successful.
In reality though JC never did much for the longevity of his games, it was always the modders and communities. I mean not to spite him because he did give us the engine but, it was always the the outside forces keeping the game active.
Consoles for the most part are outdated and all about money. What I like most about a PC game is that when I say "hey do you want to play quake?" we connect to a dedicated server and game it out. There is no " oh well I have xbox and you have ps3 so we cannot play together, oh noes!"