The 5770 and 4870 trade blows, one isn't indefinitely faster than the other. They also both came in 512 and 1GB variants.
For 120 people are expecting a generation of improvement (Or even two generations of improvement) over the 5770, what we've gotten is pathetic.
Well you haven't gotten it quite yet, but yes, it does seem pretty lame.
Mind you, apparently it kicks the 550ti's back end so hey, horses for courses and all that.
You can't really expect much out of a £120 at launch GPU apart from plenty of sodium chloride to wash away the hyperbole. Or is it Verdetrol?