I don't much consider Edge to be a face. We automatically classify guys in feuds as one or the other because it's always been good guy vs bad guy. Edge isn't really doing anything different besides going against a completely over heel in Jericho.
That promo he cut with the whole spear spear spear thing was pretty lame I thought, and it just seems Edge is much more comfortable in the Rated R gimmick.
I suppose there are things he could do, like mentioned above, to make him more credible as a 'face' but WWE and all of us know that being a great heel is where his true marketable talent lies, and don't think they'd want to waste the time to give him a new look etc when he will undoubtedly be making the transition back to what he is good at before long.
On the other hand, he got huge pops when he came out so the fans are definitely behind him just the way he is. I think that is more than enough to carry him through this feud with Jericho while they work on something else to put him in after it. Kind if sad though, I think that they could have done a lot of good things with the feud between Edge and Jericho, but already it has a culmination point at Mania.
As for rating him as a face, I give him a 5/10 since I don't consider him a true face.
But an 8/10 for the reaction he is getting from the fans, going against Jerichos heel.