I mainly just hated the writing. I tried to like the characters, but I simply found them flat compared to
just Mass Effect 1. Garrus, Wrex, Liara... heck even Kaidan and Ashley had tons of character. Well maybe not Kaidan (ha ha) but at the very least he had a well-defined personality.
Andromeda felt like a cardboard version of the original, or perhaps a fanfic, and the bad guys were generic as hell. I play through the entire trology at least once a year because I love the franchise, but Andromeda felt like an unrewarding slog.
If you ask me what it's best aspect was then I'd say the ability to romance a Turian when playing a male character. Vetra was actually kind of a cool character and so was the Salarian pilot, but I cared little for the rest.