Same here, although I've got 2,3,4 all installed currently as I've been trying to do the weekly challenges. It's a nightmare though as there's no rewind in the time trials and I'm, frankly, awful on bike games...
I do have a bronze in this week's challenge on Ride 2 though 🥳
Ride 2: So far, I like the career setup with the 8 races per season. And I really like the bonus stars concept with the daily challenges rotating. It really gives you something to draw you back to the game every day, but doesn't have a FOMO element - perfect for me.
Ride 3: I haven't really started this yet, but again I like the card concept in career mode.
Ride 4: I hate having to complete licences to unlock the career mode especially with the inconsistent difficulty levels in all these games. Somehow I managed to fluke licence 5 in the European league licences after umpteen attempts, and actually complete that set of licences, so the European league is available... haven't got any further on this game yet though.
Ride 5: this one can be played using cloud gaming on my Series S so I haven't needed to install it. But there aren't any daily or weekly challenges on this one for me to play and fail at

, so I've not played it yet.
I really am still learning how to adapt to bike racing instead of car racing, so I have AI set to very easy. Racing line is just on for corners as the braking zones are very different to car games.
Auto brakes are OFF and Joint brakes are OFF as I want to learn how to use these, plus auto brakes slows you up way too early for the corners.
As for Ride 6, I will buy it down the line, as with the others. The whole "jump on the festival bandwagon" is rather tiresome now, though, although it just mirrors real life.
I've noticed that all of the racing circuits in the UK are starting to do the same. Thruxton had a "Thruxton Retro" festival in the summer that I went to. So it's what people seem to want. And, I must admit I really enjoyed the Retro event, so I shouldn't complain.
The day 1 DLC I hate entirely as a concept, but it's hardly unique here, see PMR doing exactly the same. There's a lot carved out to the 2 DLC seasons, but to be fair...
277 in the base game still sounds like a lot of content.
There's also something else to consider. If everyone waits till the game is heavily discounted, we might not get a Ride 7.
I did that with Grid Legends and regret that as everyone else did the same and now there'll never be another Grid game...
Most people waited for sales to buy EA WRC and now there'll never be another Codemasters rally game...
I'm coming round to accepting that, personally, I need to start supporting racing games earlier (and paying more for them) where I can, as we don't have many left! But they have to warrant support, so I cant preorder unfortunately. At least not yet, I need to be convinced the game I worth supporting first. I might still preorder Ride 6 Ultimate Edition once I've seen more info.