This is all about a definition of what's 'fine' for a specific task, and that's obviously going to vary massively with expectations, experience, and requirements.
There's absolutely no doubt that the ADA8200 -- which replaced the ADA8000 -- represents extremely good value for money because you get a lot of facilities in a very compact space, it does what it says on the box, and it doesn't cost very much. Yay!
It's also easily demonstrable that the ADA8200 is a worthwhile step up from the ADA8000 in terms of its technical performance and sound quality. And it's technical performance is certainly better than a lot of the semi-pro equipment I cut my teeth on in the 70s and 80s.
So, if you want to use it to feed a bunch of synths into the spare ADAT port of an interface, it'll get the job done very cost-effectively and its limitations won't be revealed to any significant or relevant extent.
However, if you're recording a classical concert and need to run a bunch of high-end mics with 60dB gain into a high-end recording chain it's weaknesses are definitely going to start to show. I don't think anyone would be surprised at that, given the price differential, but headroom, distortion, noise, and jitter artefacts can all become audible* and all fall well short of the technical and audible performance of any high-end preamp.
So, there's 'fine' as in adequate, and there's 'fine' as in exquisite... and they are very different things!
Budget equipment is what it is -- and is entirely appropriate in a great many situations. But let's not confuse convenience with quality. Headroom, distortion, noise, and jitter may not matter too much in some situations, but they most certainly do in others -- and avoiding those kinds of problems is both difficult and expensive -- and there's no way around that.
*I was surprised to find an ADA8000 in a BBC OB truck a few years back. 'Da Managment' had had one installed because it was cheaper than any other 8-channel mic pre and they needed the extra channels... But it really wasn't difficult in a blind listening test to identify which mics were routed through the ADA and which through the SSL console!