Pfizer's valuation looks attractive, but that doesn't mean the stock is a lock to outperform the broader market. Pfizer (PFE 0.86%) can be a polarizing stock to own right now. Its future remains hazy given that it is facing some troubling patent cliffs and revenue from its COVID-19 vaccine is dwindling. But at the same time, the shares look cheap, and they could possess a lot of upside in the long run. Investors, however, aren't exactly loading up on the stock. Year to date, it's down around 3%. The shares' ...