I'm not saying it was *terrible* but think about it:
-terrible color palette range
-side quests that lacked voice acting, dialogue options, choice
-simple, linear cities with very little to do
-the removal of inventory (not that ME1 had a good system, but it wasn't unfixable)
-the complete lack of a plot (you need to invade a homeworld, so you recruit 12 ground troops? why? and then you just blow up a base and it ends? what? what did we accomplish?)
-goofy, porno-quality romances with awkward animations
-complete segregation of gameplay and story (the combat and dialogue can only occur in the designated "combat" and "dialogue" sections)
-character is required to stick entirely either to paragon or renegade choices in order to save the whole team.
-antagonist has all the depth of Dr. Claw
-nonsensical ret-conning of lore in order to hastily justify awful gameplay changes (thermal clips)
-nonsensical, unexplainable technology simply to make the marketing more interesting (Shepard can be resurrected after suffocation + atmospheric reentry + impacting the surface of the planet)
-terminator baby boss
-a soundtrack that, while still good, has an action-movie feel rather than the utterly incredible science fiction soundtrack of ME1
Sure, the gameplay was more polished than ME1's, but it was also a lot more generic and sided more with third-person shooter elements over RPG elements. On the whole the game was a regression from ME1 that took away more than it added.
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It was my first Mass Effect game I played and I enjoyed it.