Glenn being alive has literally ruined the show for me.

And on the Shane thing, Rick killed Shane because the guy snapped only a few months after the outbreak after nothing that bad had (comparatively) happened, he was probably right to do it. Rick has finally snapped after leading the group for so long through some utter hellish situations. His transformation has been fairly gradual and at least makes sense.

But like I said, the show has been ruined for me now with Glenn being alive so who cares.