Main thing is balance, IBU's are nothing if the beer is out of balance between maltiness, sweetness and bitterness, the most bitter beer ever could be beautiful if it had enough malt flavour to back it up, and the least bitter beer could be fine if it has no sweetness or malt flavour (except that it would taste like Corona )
From what I have been told over the years...
Pilsner Urquel: 42
JS Pilsner: 35
JS IPA: 45
Little Creatures: ~35
But yeah, DJR was spot on with his comments about balance. You may be better off focussing on the bitterness to gravity ratio (or BU:GU). Take the IBU and divide it by the last 2 numbers in the OG (ie if 1.050, then use 50). Some BU:GU ratios I work off are:
English Bitter: 0.8
APA: 0.75
IPA: 0.9-1
Easy drinking pale ale: 0.65
Czech Pils: 0.75
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