@jorkany
That depends on how you look at it. If you simply compare an old Amiga to a new one, the new one leaves it in the dust by a huge margin, hence bigger bang for buck. Of course, one could also take a PC bought in the 90s and compare it to a new PC and say the same thing.
You, on the other hand, factor in your personal desires/expectations and compare the new Amiga to what you wish that it were (I know you said that you were extrapolating from what it was, but it's the same thing). Obviously your expectations for a product that hasn't been developed continuously by a large corporation is rather unrealistic. Clearly you won't be happy with one of these new machines.
Personally, as someone who actually has Amiga OS 4.1 (not the SAM), it really is a much improved version of the original Amiga OS.
Hans