Backlash against ME3 was so immediate and vitriolic i didnt play it for many years despite being a ME2 superfan.

When i did play it, i found it fine? Returning characters all felt like they had parts to play, the gameplay was good if not great and the locations visited all felt like it was worth the time taken. I think the ending is a bit boring, but not world-endingly catastrophic like early critics wanted you to think.
Worse than 2, better than 1, Play it if you thoroughly enjoy 2 and want more.