I could see that. I thought it was more along the lines of the 2203 reissues, which I find a bit thinner than the originals or even the late 70's 2203's. YMMV of course.
I have a 2203X. I was in a band with a guy who had two originals, one of which was dated 1982.
My amp sounded virtually identical to that one, and a lot better than the other. The tech who services my amps said the 2203 reissue is the first one where Marshall got it right.
Of course, if you're not into 2203 tone, the JCM1 won't be for you. If, like me, you're stuck in 80s metal land, it's a dream come true. It responds to overdrive and distortion pedals superbly (better than the JTM, tbh).
The built-in boost is decent but I much prefer my OD9 in front.