I don't disagree, but I think trying to evaluate Joust in a (what will be) stale meta is also premature. Sure, at first people are going to try and incorporate new cards into already successful archetypes, but once people get more cards and can build new archetypes is when (I think) Jousting will find its place in the meta.
Why? At this point it's fair to assume that Blizzard is making a concerted effort to move away from the aggro-focused meta, and that breaks open the potential for a new mechanic.