Brian is fairly awesome, if his work on TFS at the Table is anything to go by. I keep meaning to get into FF7 Machinabridged but there're only so many hours in a day. How bad am I missing out on a scale of 1 (Raditz) to 10 (Cell Games)?
Yeah, what the show does to fix the dynamic between Cid and Shera is genuinely
brilliant. Honestly I'm not entirely sure what it is exactly about Brian's performance that really stands out to me exactly. He doesn't get a lot of the showier performance moments that others like Tifa and Cloud's actors get, but the energy and vibe he brings to Cid just...
fits the character perfectly.
As for whether you should take the time watch the show or not, that's a bit of a tricky question. Personally speaking, I really love what TFS did with FF7MA and their interpretation of the various lore and character arcs. However characters like Cloud, Tifa and Barrett initially start off quite a bit differently than diehard fans of the original game would expect them to be.
Especially Tifa. I assure you though that this changes as time goes on and that it's generally in service of the plot and development.
Moreover, unlike TFS' other Abridged shows, FF7MA had a rotating line of writers in the first few seasons. Antfish is there on the writing team from beginning to end, but Season 1 was more led by Takahata101. From Season 2 onward though, Antfish was essentially the series' primary showrunner.
That said, if you stick with it and put your trust in what the writers start off doing with some of the characters and where that ultimately leads their character development, FF7MA is legit up there with DBZA and HUA in my book. It's kind of like what happened with DBZA in my opinion; the show had its growing pains and initially focused a lot on the humor, but as it goes on, you really get invested in these depictions of the FF7 crew.
There's a number of fine, small touches across the show that really help endear these iterations of the cast to you over time and appreciate them apart from the official depictions of the same characters and story. In fact, there's one particular thing they do in the Season 3 finale that adds a whole new level of emotion to one of the game's more iconic/gut-wrenching plot beats.
I'd say the show is absolutely worth taking the time to watch it all from start to finish, but be prepared for some possible shocks on how Cloud, Tifa and Barrett might initially come across to you in the first season or two. As things go on, the payoff is really worth it IMO.