In terms of pure gameplay and mechanics, the first Mass Effect is incredibly rough, it's really hard to go back to.
That it was such a success and led to an incredibly successful franchise despite that, shows the power of its writing and strong characters and world-building.
A similar thing goes for another legendary series: Assassin's Creed. The first game is borderline unplayable, but it was still enough of a success to spawn AC2 which was a masterpiece of storytelling, although the fundamental mechanics weren't really smooth yet even at that point, and improvements were made all the way through brotherhood to AC3 and then black flag.
Over time, the story-telling and characters weakened, although there were some gems along the way such as odyssey.
>In terms of pure gameplay and mechanics, the first Mass Effect is incredibly rough, it's really hard to go back to.
Anyone who says this isn't the case needs to go back and play it. It's TOUGH gameplay wise.
It's because of the Star Control II influence. The Gameplay is important, but it's missing so much QoL. That being said, sometimes the gameplay harmonizes with the storyline, especially escaping the Shofixti to talk to them, the Druuge, or playing around with the Utwig's Planet destroyer (which ends your game instantly if you press "use" on it).