...I had no idea WS 4 (although, some of those are MEQs, and when I say 'Marines' I mean Chaos and GKs too) was so common. And Ogryns are junk even if they do have WS 4. Why did they even get a mention?
(Just note; I do have a unit of Ogryn in my army...And they have only seen table-time twice).
Maybe it hasn't occured to me to get into Assault since my guardsmen are hitting on 4s against most things anyway. Somewhere I just assumed my Guardsmen were just as good as everything else. How I actually believed that, I don't know.
...Still, I stand by Seraphim > Celestians. Even if my Holy Hatred views are somewhat misplaced (although not working on anything with the Independent Character {even when part of a unit} rule or Monstrous Creatures takes some of the punch out of it). Celestians are a pretty bad Assault unit when it comes down to it. Sure, you might hit, but you're still at Strength 3 and you only have one attack.
Again, could be my play-style. No-one (on this board, at least) seems to play the way I do...
...That being said, Seraphim do cost more points, but, don't need to take a Rhino/Immolator.