For strictly on value at 120-1 (although they are 75-1 on bodog), I can see this team being a good choice Stephen.
Personally speaking, I'm looking hard at the Texas Rangers at 22-1 or the New York Yankees at 22-1 because to me, both of these teams can do 1 thing that the Marlins can't. Get help in the middle of the season if they are in contention.
The Rangers are an interesting case because they are the defending AL West champs, and if Yu Darvish comes back and is healthy (projected to come back in May), they have a legitimate 1-2 combination with him and Hamels. They provide that right-left combo in back-to-back games that I think is a nice luxury to have in a playoff series. Plus, the Rangers have a few of those sneaky-well-if-everything-goes-right type players that make betting them on the futures an interesting case. One of them is Jurickson Profar, once considered the top prospect in the game and has been riddled by injuries. The other is Joey Gallo, who if he can cut his strikeouts by a fair percentage, has the power to be a force in the middle of the lineup.
On the other hand, the Yankees, well, you should already know where I'm going. In a day where bullpens reign supreme, they have the best 1-2-3-4 combo you may have ever seen on a MLB team. Wilson, Becantes, Miller, and now Chapman is deadly. They can shorten up the game better than almost any team. I realize that this is a team plagued by depth and older position players so an injury to their starting 8 probably affects this team than most. However, if they stay healthy all year, watch out! If their starters can take them 5 innings in the playoffs with the lead, does any team have a more lockdown pen than the Yanks?