is it supposed to be like that?

Hard to tell if it is out of focus or not. It appears to have been made at a very low resolution. The lens certainly does display a ton of barrel distortion and that is the fault of the lens to be sure.
 
I have the 18-70 and it is very sharp.
You need to test this out in some structured way to make any good guesses.
Tripod, delayed shutter release, manual/auto focus, range of f-stops/speeds - the entire routine.
 

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