Maybe I misunderstood your post, but I was under the impression that feral was doing fairly well in the F2P bracket. Rerolling a ret pally or enh shaman after playing a druid might be a bit of a shock. I haven't tested out a shaman yet, but the difference between my pally's ret DPS pre-MoP and post-MoP was embarrassing. All I could do in BG's was act as a meatshield because I hit like a level 5 kobold with no candle and went OOM after 2 heals.
Alas, I respecced Prot and those problems were solved. It was the completely opposite end of the spectrum, to the point where it wasn't exciting to play my pally anymore. From what I've heard, though, enh shaman are in a pretty similar boat to ret pallies (though their DPS might be a little better than ret's, they're still towards the bottom of the totem pole). I don't know if you're unaware of the current state of ret / enh or just rerolling an underpowered spec for the sake of the challenge, but if it's the latter then I commend you. And if it's the former, well, you should reconsider what toon to make.
And if I totally misunderstood your post, then I apologize for making you shuffle through my writing.