There has been much talk about the Spirit version of Glorfindel, the consensus being his (dis)ability is not much of an obstacle due to very low threat cost and the obvious combo with the Light of Valinor. I would now like to share one aspect of it that may not have been discussed. And that is the "usefulness" of the forced effect. In our coop games, we've been starting with the initial threat levels of 24 (player controlling Glorfindel) and 25. It has proven useful on quite a few occasions to raise the threat of the Glorfindel player to equal up to the other player on round 1. It allows for more strategy options, the most obvious being the Snaga Scouts in MaO or Caught in a Web. Thus we often opt not to play Light of Valinor on round 1 even when we already have the card.
ps: For similar (and more potent) strategic reasons (and the beautiful art) I am a big fan of the Song of Earendil but I currently cannot find place for it in the two decks we run…