As you well know these forums are not the official forums for Valorant so any advice or comments are not from riot themselves.
That being said, the game is still new, and yes it doesn't have ranked yet and for good reasons.
- They want players (including new players, especially to FPS games) to get the feel to the game. makes it fair for everyone.
- The could be (there is!) bugs to squash and it's silly to bring ranked into play when there may be bugs/issues.
- They could be just working on issues towards ranked that were already there.
For your comment on people leaving the game and not coming back, I get it. I had 3 people leave my game and it was not fun and we lost the game. Yes i wasn't happy but these things happen, and not just with Valorant, they happen with Lol, Overwatch, Fortnight and all the other multiplayer games.
Reyna is pretty OP, there is no denying that she needs to be nerfed. New champs, or in this case "Agents", tend to be a bit overpowered and that's ok because she will get nerfed (in the next patch). Agents will be buffed at times or nerfed depending on the need.
All in all Riot released the game a Finished product early in a world that has now changed due to a horrid virus. Yes there are bugs/issues. Yes an agent needs to be nerfed. Yes their are those players that leave games. But that's in every game, and every game has their issues with bugs/issues etc.
I'm sorry for the essay as a reply, but I was hoping I could help clarify and give you my point of view towards the matter (Plus its 12AM and I'm bored!). But if you need me to clarify any more issues let me know 🙂