(I have said this in a previous post) As someone who had a Nexus One and has a ZuneHD I can tell you that it is IMPOSSIBLE to use those devices outside in the sun. I couldn't call 911 if my life depended on it. So unless you are a shut-in who does nothing but sit inside all day, OLED screens are nowhere near ideal. Yeah, they do get better battery life, and a lot of that may be the fact that people use their phone less because it can't be used outside during the day!
As for 802.11n, do you need 160Mbps speed on a phone? Do you ever cap 54Mbps on a phone? Heck, can phones even process data fast enough to reach 160Mbps?
And I get 5 signal bars on my iPhone, so I really don't think its a phone issue so much as a network issue.