What are they marinating in?
Are you looking for strictly BBQ ribs or just a good recipe?
Alton Brown has a good rib recipe, Love Ya Baby Back, on Food Network.com. It has a rub and then a braising liquid recipe for the oven. They are slow cooked and then you drain the liquid from the foil packets and boil it down to a sauce, cover the ribs and I broil them to get them crispy. I think he finishes them on the grill.
I sometimes do a rub of just salt, pepper, paprika, garlic powder, brown sugar and maybe onion powder. Then I cook them in foil packet with a touch of bbq sauce. I have also thrown them in a pan and covered the pan but the individual packets with a half dozen ribs in each work better. Then I take them out, cover them in sauce and broil them to get the sauce carmalized.
ETA: Alton Brown's recipe calls for cooking them on like 250 for 3 hours or something similar. I cook mine on 300 for about an hour and half, then broil. I don't like my ribs totally falling of the bone, I like a little work to get them off.