I couldn't disagree more with this.
I found Meer's performance overall to be better than Hale's. Meer's Shepard reminded me of many of the Staff NCOs and Mustangs (officers who are prior enlisted) I knew while I was in the military. Overall I thought his performance was spot on.
In contrast my impression of Hale as Shepard was that she occasionally emoted a bit too much, and I thought her performance would have been better had she instead went for more subtle approach, and dialed it down a notch or two. Her character felt less authentic because of it.
That said I do think Hale had the better performance in ME1. Meer was a little flat at times in the first game, but steadily improved as the series went on.
I guess it was more up to individual taste really but I don't set myself thinking that Shepard need to be a true soldier first. I don't think you need to have military background to enjoy a military scifi, just as you don't need to be a scientist to write a scifi. Then again, default Shepard is an actual supermodel turned soldier complete with fake tan. I still have old fashion mags in storage with his DKNY ads, so my suspension of disbelief is really thin when he's concerned.
While on the surface, they're both the same person and had Jennifer Hale acted Shepard exactly like she did as FemTrooper, I wouldn't complain. But I find BroShep appalling when at times Meer acted like he was speaking to a wall. It was only very much later that I found out that they were just reading lines and performing them on the fly. So in the game, you're tolerating an amateur against a collection of experienced professional actors. I find myself being really unforgiving when his inexperience shows. In ME2, his badassery is definitely more impressive than Hale's Shep. He's an action hero, he get all the girls hot and bothered, he love pummeling through everything with a rocket launcher, "just like old times, I should go". He hit a lot of right angles in ME2 that appeal many and it work for him... until you realize that isn't it odd that he's supposed to be this dead soldier who came from the dead. But in ME3, he veered again when the writing require him to portray his sensitive human side.. which was hard to do considering it was relatively absent in the first two games. Yes, he may improve and grew confident as time goes by but inconsistency like this can really affect how you resonate toward the character.
At first, I don't understand why ME2's FemShep became so much more reserved, mechanical and cold Terminator (and of course, with masculine animations) and then I realized she's acting like someone who have been through a lot, who suddenly wake up in a nightmare where everyone need her to save the galaxy again, she was drop into an impossible situation again, she felt out of control and out of touch with reality but trying to appear tough on the outside. So in ME3, when they decide to play Shepard with a humanized angle and dealing with PTSD, it really didn't feel out of character for FemShep who was still just as stressed, scared and miserable and still coping with the horrible things that happened to her since the first game (and before that too with the right pre-history). I have more empathy with this woman and she has been consistently displaying her inner strength and resilience the whole time which is really admirable. That was the Shepard I knew and love and frankly that was the Shepard I felt everyone inside the game resonate with. A flawed human being who isn't a hero, a woman who simply too stubborn to give up.
Even Mark Meer and Jennifer Hale never met until post-production of ME3 and in a convention of all things. Doesn't that alone tell you that despite all the years, their Shepards are just strangers to each other and its moot point anyway to compare.