Steep is a good choice for anyone interested in the action sports genre. I only have the base game and Road to the Olympics so I cannot comment on the other dlc packs. The base game includes snowboarding, skiing, wing suit and paragliding so you aren't stuck with 1 discipline. Other activities such as sledding and base jumpingare included in the Road to the Olympics. The downfall to the Olympic expansion is events such as Big Air and Halfpipe are tied to a repeatable story line, but being able to take an old school runner sled down the slopes of the mountain side was worth the cheap price in my opinion.
The base game has a large area set in the Alps with Alaska, Japan, and North Korea added in Road to the Olympics. Each of these areas offer a vast landscape in which you can freely explore which is a major plus seeing how most games of this type lock the player into premade courses.