I don't really get when people say that. The combat is the same as ME2 but better. I do prefer ME2 squad over ME3 but I don't really see people bringing that up when they say ME3 wasn't good. I suppose people didn't like the plot or something but I didn't find anything really wrong with it and I thought they did the best they could with dealing with the multiple choices and ME2 suicide mission as variables. My opinion might change when I get to replay ME3 but I don't recall disliking the plot/writing or noticing it being any worse than the first two games. I am a hater of the ending and also those annoying af dream sequences but aside from that I thought it was a great game.
Agreed, the gameplay was overall better, but 'quality gameplay' is determined by the era a game is released - That's why so many gamers really want there to be remakes of MGS1 and KOTOR because the stories, characters, and world were all awesome, but the gameplay and graphics have aged like milk.
Great gameplay is important, don't get me wrong as far as ME3, but the writing, characters, and world are actually much more important to get many gamers emotionally invested into the game than the gameplay.
I mean I know it's just opinions but I just don't really see how the writing was much worse than the other games. I'll be paying extra attention whenever I get to it.
I only played through the game once, but this is what I remember - The decision to make the ME1 choices of saving the council and not killing the rachni queen being canon in ME3 - was a very bad move.
The new characters were lame, and all the old characters that weren't in your ME3 squad basically had short cameos. With the exception of Jacob, every ME2 character was far more interesting than every new ME3 character.
Oh, and Javik? The protean DLC squadmate that's the last of his species that's millions of years old? And has a jamaican accent? Give me a fucking break.
The side-missions's narratives were... weak, and that's besides the fact the awards you got to the war economy ended up being irrelevant for the ending.
That said, it wasn't all bad. Mordin, Legion, and Tali's stories were awesome. No complaints there.