Is My Usb Drive Slow Because It S Defective

The speeds published for it on the Internet are:

write: max 20MB/s

read: max 22MB/s

And:

write: 5MB/s

read: 10MB/s

However, on my PC I only get:

write: 2.5MB/s

read: 11MB/s

I have a 2 GB version of this USB and that gives good results write: 9,5 MB/s read: 16,5 MB/s.

Do you think the 16GB drive is a bad piece?