I have a 210H and have used it for coming up 3 years, I love it! I've tried dozens of amps out and owed a couple of others and I always go back to the JVM.
For it has everything I need in an amp and some extra features that you don't find on the most expensive boutique amps.
Two very good channels, great foodswitching, responsive controls, decent build quality (mines a Made in England if that makes a difference), top notch customer support, high quality reverb, second master, very good FX loop/s, MIDI... I could go on.
I would agree he voicing is a more towards the modern side, as said earlier in the thread the OD on the 210/205 heads is the OD2 on the 410. But I have no problem with that.
I mostly used the Clean Green channel and the OD Orange channel. The clean is fantastic! Especially with the reverb on! I think the OD is perfect for 80s hair stuff to modern ultra high gain metal. If you want less, the OD Green is killer too for classic rock/ACDC stuff. It's so easy to dial in good tones.
I don't really understand the complaints about the gain being un-usable. I personally don't see what that even means and don't find the amount of gain to be a problem.
Two friends of mine have used 205Hs for 6 or 7 years in a local metal band (Maiden, Priest type metal with a twist of Trivium and Dream Theater esque stuff). Every time I go see them, which is 90% of their shows, they have killer tone. They work great in a band setting, very defined and they cut very well in the mix. Plus they both have had zero issues with them. They've shared the stage with bands using Mesa, Bognor, Modded Marshalls, Blackstar, Laney, Axe FX... JVM wipes the floor with them all.
It’s a real boutique killer in my opinion. I think most people on here are put off by the Marshall name, as it isn’t expensive/rare/desirable. It's the bread and butter amp brand. Everyone has or has had a Marshall at some point.
Sure there are shortfalls on some modes and thinks people would like to change but it’s all a compromise. Giving the clean channel more bass or making it more plexi like or fender-ish would affect the other channels, I think the designer did a great job balancing all things as a whole. Let's not forget the same person went on to design the 5150III if I remember rightly.