It will always look "bad", its only a 8 bits ADC.
Vertical resolution 8 bits (11 bits with Hi Res)
I know 11 is not that much but in reality it's 3 orders of magnitude bigger.
And don't forget the 2.5 Gsps, show me a DAC that's 0.4 ns per sample, say you get the 500 MHz scope that's 2ns per point with 5 samples to determine that point.
As others mention, the purpose is not precision but to be able to see the waves so say you get this:
DAC5670IGDJ (14bit, 2.4 GSPS ) That's 0.417 ns per sample so you will have a 480 MHz scope with more vertical resolution, but it will cost way more because you have to add support logic for the extra 6bits or extra 3 bits for the high resolution.
But what does the vertical resolution give you? more precise measurements? sure but it comes at an exponential cost. Each bit doubles the resolution and math functions etc, so 2^6 =64 times the detail that you have to support, that's going to cost quite a bit of money, power and resources, and for what?
Then consider that because of the extra resolution your noise gets bigger so you have to deal with that as well.
Edit: by bigger I mean, it renders the lower end bits useless.
Edit: think about this, how come we don't have 10 based digital chips, heck we can measure 0.1 volt increments right? so 0-1V at 0.1V and we can have decimal computers. But it's really not that simple.
Edit: also consider the setting time of that fast 14 bit chip at 3.5ns, so you couldn't do better than 285 MHz.
Argh, edit again: The thing is that oscilloscopes are tools for the time domain. You want to use them to see what is happening in the smallest time possible for high speed communications or what have you.
I mean what is more important anyways, being able to see your signals changing states or to measure the voltages missing the signals?