I have tried and tried many times but three of my four issues are unresolved.
1. Lagging (fixed I think) 2. No good email client that supports Exchange[1] 3. Plasticky build quality [2] 4. Very, very weak keyboard input
[1] Plus having to encrypt SD card makes Android slower [2] Yes, HTC One is better
2) Most of my Android devices have come with a default mail app that works perfectly with Exchange.
3) I've dropped my last 4 Android devices frequently and they've never broken (not saying they won't, they do, but it takes a bit of gusto to do it). I don't know a single iPhone user who hasn't had to replace their phone once a generation because they dropped it and the glass broke.
4) Keyboard input is definitely not the problem on Android, there are more keyboards available, and several are widely regarded as better than iOS's. Swype like keyboarding, which I think the new default Google one has supported for a while, is transformative.
2) It works fine with Exchange, but is lacking in features. It has, however, received a major overhaul in KitKat, so perhaps it's better now (haven't tried it yet).
4) So if there is a market for keyboards, it would suggest that there is a problem with the default one! I totally accept the point that Android has the benefit of selecting which keyboard the use wishes to use, but to use a term you seem obsessed with, you are moving the goalposts.
Comparing stock Android to stock iPhone is missing the point.