Improving and learned a lesson from ME1. ME2 has many QoL improvement. The combat more action-y, the plot and world expanding, really interesting characters. The idea of importing save from ME1 to ME2 also great especiall for building its own canon.

Not without its flaw though. ME2 suffers from many weird design choice like the controls also many plotholes and lazy writing, especially on the DLC characters. No more mako though.