someone looking in to slander lawsuits
Slander's verbal, you mean libel. Further, it isn't libel, it's opinion. I can say 'I think your store sucks' and you can't sue me as I'm merely expressing my opinion of your store. I can even say 'I think the store sucks because everytime I've been there the staff has a shitty attitude' and it STILL isn't libel - it remains opinion.
Now, if I were to make a fact based statement that was false, say something like (and I'm not mind you, this is merely an illustration of the concept), "I think the store sucks because they sell magazines advertised as pre-ban when they're not," I MIGHT be guilty of libel. Were I to be sued, I could defend myself by demonstrating it's true. If I couldn't do that and IF you or the store could prove actual damages directly related to my comment then they or you might win a libel suit.
Aside from that, it's just opinion.