Not unexpected. There will be people who are not disappointed as they have different views and expectations.
Take a look at the Metacritic report for ME3
ME3 PC
Metascore
89/100
Generally favorable reviews based on 23 Critic Reviews
User Score
5.9 / 10
Mixed or average reviews based on 6772 Ratings
Also of note
Q: Are user votes included in the METASCORE calculations?
A: No
It scored high with "Critic" well 23 of them that were not "disappointed"
Yet 6772 users who rated the game gave it barely above average score of 5.9
Which do you think is a better statistical sampling a score form "23" critic reviews or a 5.9 score form 6772 user ratings
There is also the fact that some look for different things in games:
- some just want "challenge" " mechanics" "action" "DPS"
- some would rather story, romance,relationship development & side quests other npc character development, companion conversations, lots of cutscenes , involvement , choices options that genuinely matter change the game path, story, interactions , environment similar more similar to an interactive movie than a " action game" ( think tabletop D&D experience)
So yes there are going to be people who react both positively and negatively.
The question remains who will be the greater proportion when the dust settles.
For the reason stated above I have a dread it may be another ME3 situation and so I am not willing to risk another disappointment and was already suffering from buyers remorse before the game was even out.