No PS2 collection will be complete without Band of Thieves
This is an improvement. Sly 2 also makes you feel like a thief rather than playing as one. It's fun. You also can switch to Murray and Bentley when push comes to shove. Also the makers see to it that these two are just as important as Sly. For example the seventh-level boss, Jean Bison, who is a large bull that is very strong you have to face as scrawney Bentley. It's quite fun actually.
The plot itself is also quite fun. They make Clockwerk a villain without even being conscious. It's quite innovative and original.
Overall Sly 2 is a great game and is far superior both to its predecessor and its successor.