Not having as many squadmates as in ME2. One of my favorite aspects of ME2 was having this diverse range of interesting characters to choose from.
In 3... you had Garrus, Liara, and a bunch of humans and EDI who was nowhere near as awesome as Legion.
And no I don't care about bullshit DLC characters.
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As long as the plot is focused on Cerberus As long as the ending is illogical (No, the extended cut doesn't fix this, in fact it only makes it worse) As long as the intro has the teleporting kid As long as Anderson stays back just to die As long as the kid is melodramatic As long as Kai Leng is the main antagonist As long as the Illusive Man is an idiot As long as there is no neutral option As long as there is autodialog As long as Diana Allers exists As long as Oriana Lawson's death scene exists As long as the Reapers help the Geth kill organics to stop synthetics like the Geth from killing organics As long as the side missions are fetch quests As long as the Rachni don't play an important role As long as the ending is A, B, C (or D) As long as Kal Reeger is killed through email As long as Emily Wong is killed through Twitter