I agree, while I don't remember it being really bad compared to other computers I was using back then (note it's been probably about 7-8 years since I last used an Amiga, so I'm comparing to 486s, P1s and such.) These days it wouldn't stack up so well IMHO.
I think the plug-in idea is good and I think they know what they are doing. The job now is to figure out what needs to be done and then do it right- that's the whole point of the "AG2 review" Fleecy was talking about. I'm looking forward to it.