ExxonMobil (XOM -0.56%) is one of the oldest and most iconic companies in American financial history. It's also gigantic. With a current market cap of nearly $500 billion, ExxonMobil is the 17th-largest American company overall, and the largest American energy company.But is ExxonMobil stock a good investment? Let's dig into the bull and bear cases. What the ExxonMobil bulls sayExxonMobil bulls can point to several key points for why the stock is poised to deliver solid returns.First, ExxonMobil's global sc ...