Mass Effect has an amazing cast of both human and alien characters who feel like real people. While just about any NPC you meet is fantastic, your squad members are the ones that stand out the most. They all have backstories and traits that are believable and natural.

Ashley is a human soldier who joins your team early on. As you chat with her in between missions, you get to learn about her history with her family and religious faith back on Earth. But then as you explore the Citadel, the game's main hub area, she makes snide comments about all the aliens around, keying you in on her true feelings about non-humans. By contrast, your scientist team member Liara is an asari: Mass Effect's species of blue female-only aliens. Despite being reserved and shy, Liara often jumps at the chance to gush about her research. Talking to her gives you the chance to learn more about the asari and why exactly she's so devoted to her academic studies.

Getting to know everyone through dialogue and squad banter is a lot of fun, making it easy to grow attached to your favorite characters.

There's something calming about Mass Effect's atmosphere that really gives you the space to think and reflect. Exploring places like the indoor trade port Noveria feels special because of the cool blue color scheme, the blizzard blowing outside the full pane windows, and the ambient, yet quietly emotional synth music looping in the background. Even the title screen has a thoughtful song playing over the beautiful sight of Earth from orbit. The atmosphere is wonderful in a way that's almost nostalgic, making you feel right at home each time you start up the game.

The romance subplots in Mass Effect are great. Playing as male Shepard, you can romance either Liara or Ashley, while female Shepard can romance Liara or Kaidan, your human male squadmate. There are certain consequences for being unfaithful where your partner will confront you or the person you're cheating with in a heated showdown. Sticking with one person for the whole game rewards you with a romantic scene near the end of the story. A lot of care and attention went into these subplots, giving you the chance to see each of the characters in a new light.

Your choices have direct consequences on how the story plays out, not only in this game but also across the rest of the Mass Effect trilogy. You get to choose between options like sparing or killing off an entire race of potentially dangerous enemies, saving or sacrificing one of your own squad members to finish an operation, and dealing with an enraged teammate who feels betrayed by your actions. How you handle certain side objectives during story missions can also have an impact on how the galaxy at large reacts to you. Each of your decisions, big and small, carry over through your save files to Mass Effect 2 and 3, opening things up for many different playthroughs to see how things turn out with other choices.

There are lots of ways to make Commander Shepard feel like your own character. The character creator at the start of a new game lets you change all sorts of options, from your hair, to your skin color, the shape of your nose, mouth, and ears, and so much more. Or, if you prefer, you can simply stick with the default male or female Shepard. You also get to pick which class you want to be for combat: soldier, infiltrator, vanguard, adept, or sentinel, each with their own unique abilities, like the adept's helpful "magic spells" and the infiltrator's specialty with sniper rifles. You can role-play as Shepard however you want, with plenty of options to customize your looks and your combat specialties for whichever role suits you the most.