Just finish the show just now and do wish I watch this after the second raid than before. Well...at least I leave the 2nd half to watch and now I am finish, I can make a very brief opinion of it. To my opinion, this is a fun comedic slap-stick side stories show which I like and it's very easy to get into the mood even if you're not a fan or familiar with the series.
Unlike the 1st show (Full Metal Panic!) which is more story driven with both serious and comedic undertone, Fumoffu is basically what will happened if you take the serious tone out and make it like a comedy high school everyday life with tons of anime stereotypes sprinkle in the show. Nothing wrong with that I have to say but I guess if you want sometime like the 1st show, you might be disappointed a bit. Even with this loss, the show is a blast of fun as you just keep watching to see what Sousuke will do for every incident of the day. Most likely getting beat up by Chidori.
For the character development, most of the development will come down toward the two main character really and even then, it's just more of the same when you think about it (Sousuke did something stupid, Chidori beat him up, Chidori feel sad, angry, etc of her feeling and Sousuke try to help her a bit during the minor trouble time. The reality is, because this is a slap stick comedy, character development is put on the back seat and what you get is basically come down to if you love the character in the 1st show. If you do, then you will love them even more in this show with more wacky things happened to them.
For plot or story development, it's really almost zero here. The whole plot is basically a high school life with Chidori and Sousuke and how Sousuke have no clue of how to solve an issue without using his military tactics. They're isn't really any continuous story for each episodes (except for the few) so, you can watch any episodes in the series in any order. This isn't a bad thing as its more target into the funny side of the show which shine quite well with the lack the story (beside, why do you need any story development here except for the basic).
Overall, this is a fun show to watch. I guess, this show is for people who love FMP but like the funny side of it. Whether this show is the better of the three that is your opinion really. For me, as a side story, it's really fun to watch and don't mind going back to it once a while. As for the series, it stood up quite well against the 1st and much better than the 2nd show.
My Final Though of the FMP Saga
Overall, Full Metal Panic have full potential which I have to say is very interest me quite a bit. The 1st show set up the story arch, the characters you will be with for a while, and the plot development of what is happening to the world in the show and how they're trying to solve the issue.
The 2nd show change the tone and make it comedic which hit quite well if you like the characters in the previous show. It didn't really help expand the story but it make up with it by putting slap stick comedy onto the main characters which did quite well.
The 3rd show try to go back to the serious drama route which did loose a bit of the charm. Even with this issue, it did try to continue the story of what happened to the team after the incident. It have quite a bit of potential here with quite of bit of new villains to go through, new characters allies, an interesting new story arch, and Sousuke emotional struggle.
What hurt it (and it's kinda a big one) is trying to squeeze all of this new stuff in with a smaller size show (13 over 24 from the 1st show). Because of this, they;re so much waste potential in the 2nd show. I don't want to go over it as I did explain in my previous opinion. I know they is a graphics novel and a light novel for this show which (from what I see here) explain what happened after the 2nd show but here is a catch.
As someone who is coming into the show for the 1st time watching this without any other people opinion, why do I need to read the novel to found out about this. Isn't the whole idea is the show trying to get the audience attention to the point where when it end, the audience want to found out more of the series by going into the novel. Doing this, you need to make the show shine so the audience will want to found out by explain the situation a bit and make it clearer. Also, don't like the idea to have too many characters in the show if you can't develop them well.
What I am saying is you shouldn't just jump into the novel (whether it's graphics or written) after watching the show if they is tons of problems which the director of the show didn't fix. Guess it's just me.....
Still, the franchise of the show is good and would let other people to go watch it if they can. Just be prepared for the 2nd show as they're flaw which you will start to questions quite a bit as you process. They is the manga you can read which explain all of this issue from what other gaffer say. I might go there one day but for now, I think I will end here and start my next anime show in my collection which will be Iria: Zeiram the Animation.