ME1 is one of my favorite titles ever. It starts off with a fun and exciting mission but after that you're doing some stuff on a space station. After that the game opens up for you to do side-quests or main missions in the order of your choosing. The space station part in the beginning was fun for me but it can probably seem like a drag to some people.
Stick with it, turn down the sound effects and dialog volumes and crank the music because it's the best sci-fi sounding stuff I've ever heard.