Definitely as already said by jackhammer, Porcupine Tree's The Incident was the biggest letdown for me. It's really not up to scratch with their earlier stuff that I love.
And also The Resistance by Muse, after all this discussion before it was released about the album having more 'classical' influence I thought it may lean towards Absolution-type style. So as you can imagine I was pretty disappointed when it came out. That being said, it is growing on me, and I am beginning to like the way Muse can be so diverse in their creations.
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