[Baffles]

1) Not tinny at all. I wouldn't say it sounds as good as a plain old landline, however it sounds just as good as my Vonage line.
2) My speaker is louder than my Mogul's with audiopara lite, and sounds nice and clear.
3) My onscreen qwerty works fine. Only spot I have issues with is some spots on the scrollbar, but thats no big deal with finger scrolling.
4) I get a day and a half or so on mine with light use. That includes MS Push being enabled, polling for email every 30 minutes, a few texts, maybe a phone call or two. My battery lasted from 8am till midnight before throwing the 10% warning, and that was with me tethering for a half hour, talking on the phone for about a half hour, and playing with it randomly throughout the day.

I have very few issues with mine, and the issues I do have barely affect me anyway. I use my phone as more of a portable internet device than a phone, so phone issues aren't top concern for me, though mine seems to be fine.