I've recently started playing Mass Effect 1 and I'll admit I found it very dull to start with. In fact it took me a few weeks of occasional play to get hooked in. For those who never managed to stick with the game I can advise you try and get though the opening sequence where you wander around the city. The dialogue can get a bit much and can put some off, but it's once you leave this city the game really takes off.
Once you've left the city you are in control of what you want to do. Sure it's not open ended, but the options are there for taking, where as in the beginning you're kind of just clicking on everything and everyone you can see listening to the masses of conversation.
I'm really into the game and look forward to playing the 2nd too.