Fighter multi-classed to cleric is a very effective (be sure to pick up warpriest at Paragon) defender, and with the right weapon selection, he'll be doing more damage too. Not more than the rogues, of course.yeah - i guess i'll have to reroll with him... Its too bad because as a DM I liked having that particular player play that class, plus I had some cool Pelor-related stuff planned that will have to be NPCed as there are no other Divine characters in the party.
We have 2x Rogues, a warlock and a warden, so hopefully he goes for a controller for more mass damage balance - 4e battles are still taking WAAAAAY too long.
Though cleric multiclassing might be something i suggest to him.
Are the FR feats/skills/powers designed to be more powerful overall then core? or balanced differently? I dont own any FR stuff so I don't know, but if so that would be a less arbitrary reason not to use any.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.