I was watching the races later on motogp.com, so didn't come here to avoid spoilers. I've seen everything so far except the MotoE race.
Moto3: Utter Mayhem. As with new seasons of Moto3, it interests me to see riders appear that I wasn't aware of before. I don't follow the entire field, and Alvaro Carpe and Matteo Bertelli are both riders I'm not familiar with, despite their racing histories so far. Both looked interesting. Rueda's win is well deserved, with him being able to break away from the group and therefore be insulated from Piqueras doing Piqueras things. And quite a few other riders taking each other out as well it seems. I was interested to see if Ogden might take a step forward. Which he definitely did in qualifying. Then in the race he dropped way back to nearly out of the points. Moved forward when about half the field in front of him crashed out or was punted out, and then fell off on the last corner. I'm not sure what the championship will be after one race, but Rueda looked good today.
Moto2: Some mayhem. I was thinking Canet would be the class of the field. Holgado looks very good, and like Ogura in MotoGP, looked very good. I noticed in Q2 how we did a lot of laps rather than changing tyres so that he could learn the bike better. His performance particularly compares well to Alonso, who was simply unimpressive all weekend. The talent is there, but it certainly wasn't on display this weekend. While things may have looked different if Vietti stayed upright, it's looking like we're back to situation as normal, mostly a Kalex cup.
MotoGP: Pretty much no mayhem at all. Ogura was great. I won't be unkind and go and look up who said that the Aprilia might not suit Ogura's riding style

Ogura wasn't riding on the ragged edge, or having to save the bike. Or making bloopers. He seemed very smooth and simply fast. It'll be interesting to see how he compares to Martin once Martin is back. When I saw that Ogura was straight through to Q2, I thought that was impressive, but expected him to be down near the bottom of the top 12. Wrong. Then in the race I thought his qualifying position was stunning, but he would drop back during the race. Wrong. Then in the feature race I thought that over a full race his lack of experience would count against him and he would fade. Perhaps using up too much tyre. Wrong. Now I'm really looking foward to seeing how he performs in future races, and how he compares to a returning Martin.
It seems to me that the GP25 isn't, as of today, yet better than the GP24. I think I heard that it still has the GP24 engine. Even so, Alex Marquez was really impressive. He beat Bagnaia cleanly and not due to any luck three times if we include qualifying. The Gresini crew looked extremely happy. It can't be a good thing for them to lose Marc even if it was obvious that he would go somewhere, but Alex gives me hope that we'll see more Gresini wins this year. Note, that's hope. I'm not sure it's better than 50/50 that he'll win one. I hope he does.
Marc Marquez still has it. He looks very comfortable on the GP25, and I think that his GP23 experience is all he needs. He beat Bagnaia in every way this weekend. I'm not sure that Bagnaia can fight back, and I predict that this year will be an easy championship for MM93.
While he fell off in the sprint, I think that Jack Miller certainly justified his Pramac Yamaha seat. As of today he's the top rider on a Japanese bike, including being ahead of FQ. OK, I predict that FQ will win out over Jack during the year, but based on this weekend Miller absolutely deserves that seat.
KTM - oh dear. Woes continue. While the bike may be the deciding factor, Acosta looks quite bad compared to Ogura so far. Binder and Acosta looked very close, but then Acosta fell off. And now Binder is quite a bit higher up.
EDIT: No MotoE races until May.