I have a lot of work to do so I decided to go to starbucks because they have free wi-fi
Can you focus there?
More or less.  I also like to use my time wisely.
It makes sense to use the free wifi at Starbucks if you enjoy spending time there. Starbucks is also a pleasant environment to get work done in general so you are making a responsible decision here without a doubt.
The scene is a little distracting. I don't like all of the noise and people who are paying attention to their own busywork, instead of each other.
If you can get your work done there, that's a good thing. It helps if you like the coffee, too.