The only one of those I could corroborate is the pen style settings issue, which occasionally irritates me too.
Price: I won't argue it's expensive and if it isn't scratching an itch you've had for a long time then it might not be worth it. Mine has provided that much value to me since I bought it, and I figure I'm paying a little extra for early access anyway (and hopefully supporting a technology that will stick around for a while).
Battery: I can see it lasting for only hours under heavy, constant use, but I've found that I only need to charge mine about once a week and I use it daily. I'm just not drawing or doodling on it constantly, so mostly it sits idle next to me and is interrupted every once in a while for a quick note.
Apps: I haven't used any of the mobile apps for it because that defeats its purpose (for me).
Pen response: has been perfect for me so far. This makes me wonder if you had a glitchy or buggy device.
Freezing up: I've seen this happen twice, I think, since November, and in my case the device locked up for several seconds and then rebooted itself, which I thought was pretty cool (a hell of a lot better job than KDE on Debian 9). I didn't lose any work, even though both times I was using it when it happened.
Customer support: haven't had to deal with them, but I'm not surprised at the lack of response. That seems to be a trend over the last several years. Nobody does customer support anymore.
Ereader: Ashamed to admit I haven't tried using this feature on it yet, just haven't got around to it.