I noticed the sound issue in the Mets/Nats game. Once where the announcer was saying there was a line drive down the right field line that was foul. On the video as they were saying that the pitcher was just throwing the ball. The other time was a line drive down the left field that was fair. Two runs are going to score. As that was said the pitch was just being thrown. I didn't watch much of the Astros/Angels game but what I did see I didn't notice the sound issue. I noticed both games had a female announcer. I thought both did a good job calling the action. At one point in the Astros/Angels game they had 4 people talking at once. Two men and two women. They need to limit it to just 2 announcers. More than two is just too ESPN'y.I watched a bit of both games, mainly the last couple innings of the Astros/Angels game. In both cases, the HD video quality was excellent (nearly as good as some live 4K sports I've seen) although I did notice occasional glitches, like a weird shake in the picture. Didn't notice the sound being out of sync at all but did hear persistent audio artifacts like a popping sound now and then. And unfortunately, no way to pause or rewind the live stream (unlike Peacock's recent live streams of the Winter Olympics). Even if Apple doesn't want to mess with that feature on their servers, there's no reason why they could use local storage on their Apple TV 4K to create a live buffer (as the Channels app for OTA TV does).
So good first effort at live sports by Apple TV+ but, yeah, they have some technical kinks to work out and improvements to make.
On the HD quality I noticed close ups on the people it was good enough that you could see their individual facial hair. It was excellant other than like you mention the weird shake during action scenes where the camera was moving trying to follow the ball or running players. That is where I could see the judder. I also had a couple of times where the picture froze and the only way I could get it going was to force quit the Apple TV+ app and re-start it.
Also you could have a picture in picture of the game along with a game from MLB.TV and switch back and forth between those two games but there were some sound glitches in that where occasionally you could hear the announcers of both games at the same time which is definitely a glitch.