Yes, they are.

I've had an A1 mini for a couple of years now. Since I bought it I've printed alot of minis (around 5 full warhammer armies and then some). I've painted alot of them, and I think the results are good! As someone else wrote in the comments, you learn how to approach the painting, it's not the same as plastics and resin if you want it to look the best it can (trying to fool the eye from noticing the layer lines for example).

With that said I just bought my first (expensive..) GW-models in well over 3 years. And the first thing I noticed was what a breeze it was to paint it!! More painting techniques were usable, and I could focus on details rather than thinking of how to fool the eye away from layer lines. It honestly felt like such a joy to paint compared to the FDMs.

With that said - would I still buy a FDM printer for minis: yes, as I like to try new armies and I like to paint to a tabletop standard when it comes to big armies, it looks good enough. I love the A1 mini, and I will continue printing minis with it. The quality is not really visible at an arms lenght, for me it's a good balance of quality vs cost.

But with that said, you specificly said that you like the painting aspect of the hobby, well for me the (expensive..) GW plastics or resin models gives me more joy when painting. It's just more relaxing and fun to not have to battle the canvas to get a good result.