The biggest decision to make in regard to going to Antarctica on an 'expedition' ship is how much time you wish to spend 'off the boat', and what style you want to experience while on-board.
Le Boreal is still probably the most stylish way to explore the peninsula, but because it carries 200 passengers, you will spend less time roaming about in the zodiacs than on a smaller ship with less than 100 passengers (by regulation, only 100 individuals are allowed onshore at one time).
Le Boreal does have it's failings though (as other reviewers have indicated), and when it comes up against all the other ships sailing other parts of the world, it would have some issues matching up.
But in Antarctica, it will not be wanting for passengers... as only a small number of ships tour there, and more and more people are visiting each year.
The staff will get better at being more professional, and the ship will work on eliminating some of the shakedown style problems.
Bottom line, if you want to visit in style, and being restricted to only 3-4 hours a day off the ship is not an issue, than you will probably not do better than going on the Le Boreal... other parts of the world are another matter.