It's hard to say. I'm playing it on PC so I don't know how it fares on the consoles (it's obv made with consoles in mind).
*** Note: There may be LIGHT ME2 spoilers below, interdispersed ... But they're light, and if you didn't know about this shit before from just hearsay, ... do you live in a cave ***
It's the FEEL of it. The 1-button-does-everything schtick. Like the "Use" or "Inspect" is the same key as sprinting or jumping or hiding or whatever else. A lot of times Shepard does some random jump & roll instead of hiding behind cover, or instead of inspecting a thing. I find it super crazyannoying. I don't remember ever being this annoyed with the controls of ME2, despite their functions being somewhat similar. I've died 2 times because I accidentally vaulted over cover, and when I couldn't seem to "unstick" from cover I was standing behind, when a grenade was tossed at my feet. Lame.
Also they use a -LOT- of the textures from ME2 (and even some from ME1!!!) -- Look at the clothes of the NPCs especially. If I'm playing this fucker on 1900x1200 with all my settings as maxxed as they can be, I should never see giant shitty JPG artifact splotches all over peoples' clothes or on walls.
The environments feel more impressive; more reminiscent of the "you're a small thing in a big world" feeling you'd get sometimes in ME1. And that's a good thing. But then you get talked at by Low-Res Lisa (who happens to have one of the SAME 5 hairstyles that all people in the universe have) and feel kind of angry at EA for not giving BioWare enough time to polish this shit.
The story also feels a lot more predictable. In 2, you were gathering allies, and wondering after the intentions of Cerberus, and it *FELT* like you had more control over your shit.
But in this one, from minute 5, you're being told EXACTLY what to do.
"You-gotta-recruit-more-dude's-to-fight-the-Reapers-bro," says every person in the galaxy.
Ho hum. Well, I could have figured that out on my own and felt better for it, but thanks for telling me 60,000 times.
Also, in ME2, you got all sorts of interesting races to ogle at/romance in your party.
The new team members you get in ME3? Humans.
Boring shit ass humans.
If I wanted to stare at humans all day long in a game about outerspace times, I'd walk my happy ass over to Space Mountain in Disney World.
Not to mention, you start out the game DISGRACED!
I am Commander Shepard, savior of the UNIVERSE, who is a Citadel Spectre, and a galaxy-slinging, asshole-fighting, skirmish-quelling DEMI-GOD of a HERO.
Not only have I saved Citadel space, but I saved the outer reaches, too.
And I DIED trying to save everyone, and then I was REBORN by a company, who I used to the last penny, and tossed out the window like a bitchy girlfriend.
I SHOULD BE RESPECTED LIKE JESUS BECAUSE I SORT OF AM JESUS
And despite ALL THE SHIT I DONE SEEN AND DID, and despite the fact that this playthrough's character is p much 100% Paragon, I was COURTMARSHALLED and STRIPPED OF HONOR & RANK and they announce all over the news that I am a MASSIVE SHITSTAINED TURDNURGLER.
In ME2, when you arrive back at the Citadel, everyone's like "HEY! It's Shepard! I thought you were dead! You're our hero! You're the bottom bitch, baby! Please endorse our store! Love us like we love you! Omggg *jizz*", and you know, call me egotistic, but it gave me warm fuckin fuzzies to know that my game was idolizing me. Shit yeah they should be idolizing me; I'm fucking COMMANDER JESUS H. SHEPARD.
But in ME3? Even though I screwed over Cerberus royal-style, everyone doubts me, I'm publicly called a disgrace, and even my PARTY MEMBERS don't trust me and look at me like a sack of shit.
Lastly: WTF, plot?
In the end of ME2, the VERY end, you talk at all your teammates (who are still alive; mine were all still alive), and are like "YEAAAUH WE'S GONN' GET'IM!!!"
And it was IMPLIED that this team would be working together NON FUCKIN STOP to STOP THE REAPERS, because FUCK THOSE BITCHES.
And then in ME3, everyone's fucked off and gone their separate ways.
Not on my god damn watch!
If even one of those bitches tried to amscray I'd do the ol' right-click knock-out-punch and knock 'em on their asses like a TV news reporter.
Anyway ... Sigh.
So that's my reasoning.
Lol I got way into that rant there.
I may change my tone towards the end of the game :x