No, I use the pc the most in the house, and this has all been with only me using the connection. I even turned the Wifi on the iphones and the iPad off, and turned off the other pcs completely.
And my feeligns are the same, I figured the wired pc would hog all the bandwidth, but it runs fine for a short period of time, then it slows way down... Literally takes 3 minutes for yahoo.com to load up, and then it times out.
Even on the phone with LinkSys, I gave them remote desktop access and even they were saying it is oddly slow, and each of their attempts to move the mouse or click buttons had to be repeated.
They pinged me and that was fine.
And this computer does not have any wireless card, so i cant hook it up that way.
Also, this is on a pc i just installed windows 7 on last week, so it's a clean system, without a lot of trash running in the background.
Aside from that, I've had no problems with the Wifi when it works, it is fast and delicious, but when the router drops it, everything is affected.