As you said, it's personal opinion. I enjoyed ME1 more than the second, although there are certainly things that the second does better than the first. Actually, I feel that ME1 story made *much* more sense than ME2's. ME2 felt great up until... Say, half. Then the leading writer change fucked it all up, and the story started to drift towards ME3's nonsense. Human reaper? Oh for ****'s sake...
Yeah, that's true.
It's just that ME's story makes no sense starting from the first mission. Even leaving aside that Sovereign and Saren could have ended the entire conflict before Shepard even arrived on the scene you run into logical errors.
The Normandy was doing a milk run while testing their stealth systems and was supposed to pick up the Prothean Beacon on Eden Prime and bring it back to the Citadel to be studied. During this mission Nihlus was supposed to evalute Shephard to see if they are Spectre material. Soooo... no one knew that Sovereign and the Geth were on Eden Prime, so what exactly did Nihlus want to evaluate? The Normandy lands, Shepard signs a form while the crew loads the beacon into the ship, then says good bye to Ashley and then they fly back to the Citadel. There would have been no action, no engagement, not even time for a training exercise.
After being made a Spectre (without anyone on the Citadel checking your credentials) you're presented with 3 main missions: Get Liara, Geth Attack on Feros and Geth Sightings on Noveria. Ehm. Geth. In Citadel space (or close to it, in the case of Noveria). And no one does anything about it? That's like having a confirmed attack by IS terrorists in Alaska and sending in your newest FBI agent, solo. Unbelieveable.
There was no reason for Saren to have the cloning facility on Virmire. There was no reason for Sovereign to use the Geth as attack force. And there really was no reason whatsoever to find the Conduit, which made Saren's attack on Eden Prime pointless, too. Why go looking for a backdoor if you can use the front door just as well?
Sometimes you get these stories because the writer(s) didn't take the perspectives of other characters into account. The ME story only works (kinda) from a protagonist viewpoint. The moment you place yourself in the position of the villain you realize that Saren as the top Spectre could easily have walked right into the Council chambers at night, fixed the damage the Protheans did 50.000 years ago and then allowed Sovereign to signal the Reapers. Boom, game over. And that was possible -years- before Shepard even became a topic.
And let's not get into the nonsense they call ship design. Or why Joker is doing every single job but engineer on both versions of the Normandy, despite there being at least a dozen crew members.
Or weapon design. No ammo... but thermal clips. Suuuuure. That's why the Typhoon is ejecting bullet cases. And the Falcon creates mini grenades out of pure energy. 
Anyway... I don't want to deconstruct my favourite games... but each of them had their flaws. They were still more than worth their money and I spent a lot of time with them. Really good games. They could have been better though.