IMO sucking in a raid should get you kicked and that's a better situation than not getting invited in the first place because it's assumed you'll suck.
I guess I should also make the disclaimer that since I raid with a guild I don't have to rely on PUGs, but I do have to laugh when I see the ridiculously inflated ilvl requirements for stuff as simple as H Fel Lord (725+ for a tank/spank fight with basic movement requirements? LOL)
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I think you didn't read the thread, everyone here knows that ilvl has been around forever.