I feel your pain. Believe me, I do.
I stumbled across this post looking for something else, but since I've been keeping a watch on Sprint for a couple weeks, I had to click the thread. Heh.
Since the long story spans about two weeks, I'll spare you the details, but suffice it to say, you are not alone.
We have not had service for just around two weeks. The Sprint reps at the local repair store (I stopped there twice), blamed lack of service on storms taking out Sprint towers (what storms?), but had no explanation why the roaming service wouldn't work. Now that I know the problem was, in fact, the "Sprint Vision Outage" and not the load of BS their reps were trying to pass off (because they honestly weren't told?), I am quickly losing my faith in them.
Back in 2001, I left Sprint to go to Cricket, of all companies, because Sprint's CS and service was so bad. About 5 years later my husband got a Sprint phone, and I quickly realized that the company had improved by miles, so I jumped in too and have enjoyed all the company had to offer.
Until Q4 2011 when they got rid of the Sprint Premier program (early upgrades, rebates, phone buybacks, etc.), everything else seemed to go to hell too.
I could go on for hours about how horribly I've been treated by their CSRs, and how I've been promised resolution for two week loss of service, but like I said - long story. The bottom line is that they are so unreliable, I will be counting the hours until I can cease my most recent 6-year relationship with this company, and plan to do some serious shopping among carriers.
I have an HTC EVO 4G too, that I I fell in love with the minute I saw it. However, despite all Sprint's investment in tower maintenance, we have NO 4G service in our market, and won't, until at least after 2014. We haven't even made the list yet here in SW Ohio. That makes the best part of the EVO useless here, so I'll probably be putting it on Craigslist unless somebody contacts me about it first.
Just know that you are not alone, and If you really want to see the range of the problem, and the regions effected by it - as well as be entertained by a lot of squeaky wheels - stop by Sprint's Facebook page. It's pretty hilarious, as long as you're not paying them for service they don't feel obligated to give you.