Sorry, I'm tired and I don't feel like writing out a full-length article on this; I do however feel like giving a list:
1) Import issues that were broken from launch and still don't properly work
2) Shoe-horned bullshit multiplayer
3) Removal of options in dialogue
4) Too much auto-dialogue
5) Squad mates with absolutely no development: Liara asked me for the 5th time if I was interested in her still, to which I responded yes to. She later asks me if I want to get with her for the first time. WUT.
6) ME2 DLC character interaction
7) Jessica Chobot bullshit, horrible voice actor, horrible character model.
8) Spurting your own fucking memes that got old YEARS before ME3 was even released
9) Insanely easy combat
10) Miserably low amount of content, I finished everything in 15 hours on my first playthrough. About 30 hours for Mass Effect 1 & 2. The fuck transpired there?
11) The god damned day 1 DLC
12) I was fighting more Cerberus than reapers, just endless drones of 'generic evil private army soldiers'.
13) Completely ignored choices, like the Rachni Queen or council member choice
14) Shoddy treatment of ME2 characters
15) James Vega
16) Kaiden and his idiocy
17) Kai Leng was a terrible villain
18) Kai Leng's atrocious amount of plot armour
19) TOO. MANY. CUT SCENES.
20) Deaths and choices that don't make sense "To give Geth personalities, I HAVE TO DIE. I'm not going to tell you why, I'm just going to die because emotional investment."
21) "HEY COMMANDER, LEGION USED THE WORD 'I' BEFORE HE DIED. HE'S REFERRING TO HIMSELF AS AN INDIVIDUAL. HE HAD HIS OWN PERSONALITY. HEY, WOULDN'T IT HAVE BEEN COOL FOR YOU TO FIGURE THIS OUT ON YOUR OWN? HA, WELL FUCK YOU."
22) The terrible introduction
23) The terrible ending and the terrible 'child'.
24) The stupid nightmare-trauma scenes
25) "Wahey, I just saved Kelly from death!" Oh cool, everyone on the Citadel is dead.
26) How do we beat the Reapers? BIG SPACE GUN.
27) "Instead of equipping our ships with Thanix cannons, we decided that a single big space gun we didn't know how to use would be better, also all of our ship tech seems to be weaker than ships in Mass Effect 1 despite rapid technological advancement due to the salvaging of poor ol' Sovereign.
28) "I blew up a planet with over 300,000 innocents. I've seen people turned into gloop. I've seen stacks of corpses piled up waist high. I've seen people impaled on spikes and turned into zombies. That's only scratching the surface. A KID JUST GOT KILLED?! FUUUUUUCK, MENTAL SCAR. BE UPSET PLAYER, BE UPSET, A CHILD GOT KILLED. BE SAAAAD."
29) Durhurr, EDI and Joker romance. Hurr.
30) The extended cut candy ass land endings. I wanted happy, not fucking rainbow farting choices! "Yep, now the Reapers are helping us to rebuild, and we're all happy and perfect now! We can all live the lives we dreamed of! We all wanted to be cyborgs! YAAAY! We've forgotten that these Reapers have killed not only hundreds of billions of innocents for a reason we don't even know, but they've killed literally hundreds upon septillions of innocents over millions of years! We love them!"
31) The final middle finger to the players who wanted Shepard to be, y'know, Shepard at the end and tell the star child he was bullshitting and that this wasn't part of Shepard's character. "NOPE, FUCK YOU, CHOOSE ONE OF OUR LAME FUCKIN' CHOICES OR COMPLETELY LOSE. WHAT'S THAT? YOU WOULD'VE BEEN HAPPY WITH THIS CYCLE LOSING BUT THE NEXT CYCLE BEING ABLE TO BEAT THEM CONVENTIONALLY? NOPE, THEY USE THE GUN. HAAAA. HAAAAAAAA. HAAAAAAAAAAAAA.".
So no, I don't think that Bioware deserve any credit, it was a god awful game and the list I've compiled isn't even a full list; I could come up with even more.