Disappointed with MPix--Did I do something wrong?

I've used Adorama's online printing service countless times with great

success. On the recommendation of a friend, I sent a batch of

headshots to Mpix.com. I received the prints today, and although I

like the "true b&w" tones, the image quality is pretty terrible. I

uploaded an 8x10 jpeg (2400x3000, or whatever the appropriate

dimensions are--I forget off the top of my head) at 300dpi, and told

them no resizing/cropping necessary.

 

By "image quality" issues I mean blotchiness in areas of fine

detail--ie, hair, eyelashes, eyebrows, all look mottled with

occasional dark patches.

 

Am I overlooking something?

I have used them twice, the image quality was excellent but while I told them not to crop, they did. I was more used to ezprints which if you tell them not to crop you would end up with a black bar and the entire image. Mpix took no cropping as something they didn't need to pay attention to and cropped off the photo. When I complained they sent me a terse reply and explaination of ratios

I've used Mpix for *many* prints. Mostly 8x12 that I upsampled to the proper DPI and dimensions. Every single one has come back stunning, and they've turned it around in record time. I'm very pleased with them.