1) Shareport works great. I rarely use it since getting an Apple Time Capsule, since nothing worked for the Mac yet. It's fast, and easy, and anyone can use it.
2) DLink TV is old. That's what they had planned, but remember, plans get broken...very easily. You aren't able to customize the OLED. i doubt we will ever see that now.
3) Netflix doesn't seem to be working properly right now. Router has been under high load from me for some time now...doesn't reset at all. Just make sure you have it standing up right to get proper ventilation.
4) No heat issues. Yeah, it does get hot, but NOT super super hot as when it was laying down. If you stand it up right, it'll be just fine. If it does lay flat, the bottom will heat up, and surely cause reboots and other problems. I've really never ever had any heat issues with my devices...even Linksys.
5) The wireless has the option to run on either 2.4 GHz, or 5 GHz. Not simultaneously however. 2.4 GHz ONLY supports wireless N, wireless G, and wireless B respectively. 5 GHz ONLY supports wireless N and wireless A. So, no...G does not go up to 5 GHz. Auto channel is bad, and to avoid interference use either 1, 6, or 11...gotta set it manually! There's other tips too, so you won't have problems... Antenna placement is another big one. Interference can be caused by literally anything. As we have discovered, 2.4 GHz is best indoors, while 5 GHz "N" and the likes are best in outside environments. It doesn't have the best penetration like the 2.4 band.
Hope this helps...