That's one thing, and the range isn't as far as they want to claim. Quality control seems to have been low with that model. Although, I have never had any issues with my router or complaints. Well besides one, but that was my fault.
Just for comparison, I have the E4200 which did connect:
1 PC Ethernet
1 server Ethernet
1 PC wireless
1 Tab wireless
2 smart phones wireless
1 Xbox wireless
1 3DS wireless
1 Wii
All with ease. The Xbox, 2 PCs, smart phone, and server used to access the network all at the same time quite often when I had a friend over here who played consoles. You can add a 3rd smart phone when he came over which was an iPhone.