I've smoked a dozen or two Opus, fresh and 5+ years old. I think they are bar none - the most overrated cigar made (Cuban or non).
I'd add Fuente BTL. Not shabby, but their scarcity and premium paid is not worth it.
I'd like to defend a few mentioned (just my opinions of course):
RASS - if you've had one with some time on it, you may change your mind
Trinidad (Cuban) - I've got some Reyes that are amazing. I haven't plucked one from the box in a few months, but they were exquisite little things. This is the only Trinidad I've had. Overpriced? YES, just like Cohiba - but not overrated.
Padron '64 - Again, a stellar smoke - especially when aged. I don't think the last few years releases are up to par with the original few releases (8-9 years ago).
Ashton - I agree with most of the Ashton remarks. The Puro Sol is terrible as is most of their regular line, but the VSG is mind blowing.