I found most IC club lounges of a high standard although as pointed by others it's not consistent and I've seen a few that were rather basic. I wouldn't expect a proper meal, but some have a very good offering. Several resorts also have a proper afternoon tea.
They're also usually fairly quiet, which should be expected considering IHG is rather stingy about club lounge access to elite members. Overall I like the IC club lounge experience much better than your typical Starwood/Hilton lounge which frankly can sometimes feel like a canteen.
In fact, although basic, all CP lounges I've been to were also very relaxing.