It is a very good aircraft!
The 757-200 cost less than the 737-900ER , has more passengers, longer range. Its great for transcon flights and trans atlantic.
The 757-300 is also very good, It cost about the same price as A321-200. However, it has more passengers, longer range, lower lease fee.
They are great for longer flights, but not short hops due to turn around times.
But the Cost vs Passenger is GREAT!