I bank with WaMu, and I have a number of online accounts linked to it - ING, PayPal, Treasury Direct. Haven't done billpay with it. About a month ago WaMu updated its site, so I couldn't get on and look for five days, and it really affected billpay.
http://tinyurl.com/hm5da
Haven't had any other compliants except that their interest rates are, well, crap...