Yes, you can get a lens which might not be too awful, or go for one which is a superb lens.
If you're looking for a lens "not to complain about", maybe a 20-300mm zoom is the right thing...
Sorry, rant over.
The suggestion to (also) get wider lenses for is good. A wide (or even a very wide) for environmental shots is an excellent idea.
A visit to a library or a good bookshop where you can see how great photographers have handled various kinds of portraits could be very useful.