I see that this review is for the 9G3 but I read it on the 7G3 page and I'd just like to clarify that the 7G3 is a standard Micro USB charger.
I've not had my 7G3 for too long, but with screen settings to auto brightness with Wi-Fi turned off I get 6 hours easily (for the record, I have a FreeLoader solar charger which acts like a backup battery and with that fully charged and the solar panels out, it'll quite happily run for 12-14 hours - a great investment!)
Appslib, as the original reviewer says, isn't great. But you can easily find software that will allow you to install Google Play (marketplace) as well as the standard google apps.
I've also not experienced any issues with Wi-Fi on the 7G3. I too like in a 3 bed semi and our bedroom is in the opposite corner of the house from our Wi-Fi Router (a Belkin Play N600) and I find reception and speed are both fine.
I can't comment on the original reviewers views on the 9G3 and 10G3, but I just wanted to clear a few points up for people looking to purchase the 7G3. It's not going to compare to the Galaxy Tab by a long chalk, but at £100 it's a fantastic budget tablet that makes a more than capable media player.