I think we really need to stop complaining about the AI in the game, I have had some very good races against them. They are not perfect, but they are certainly better than GT5. I think there are some far more important issues to address in the game instead of AI at the moment.
While I wouldn't say to stop complaining about the A.I., as the bots really do need some tweaking, I also agree with you. When you get up in ranks, say to the i-B and i-A level, the bots do get quite competitive. Until you get more than a half second lead on them, then they give up.
But I have had a LOT of good races against the bots, and the leaders most certainly did NOT give up and let me win in a large number of them. I've saved dozens of replays because the racing was so good, and in about 2/3 of them, the leaders fought me to the finish and won.
Now as to the topic, The RP Moogle is right. Add to everything in his great post the fact that PD is trying to do some very ambitious things on antiquated hardware, and their job is looking pretty tough. They want to give us a Course Maker II which covers an area of 50 x 50 kilometers, and that's a challenge on PCs loaded with ram, never mind an old PS3 with a mere 256MB of system ram. And the OS and game eat up some of that.
The online part is much simpler than what we expected. But look what PD wants to do with it, add on an Event Maker so we can create events possibly including a small racing "season." As well as club and league building tools. And suppose an improved Race Mod along with some kind of Livery Editor, even if it's templates, are going to be included to support the new online leagues.
And I've mentioned a few more things in the News and Discussion thread. Everything they want to do seems like it would fit much better in PS4, so it's more work to squeeze it into the game. And work right, without the bugs no one wants to see. I want all my goodies all at once too, along with smarter, more competitive bots and replay cams that manage to GET OFF THE GROUND AND INTO THE AIR SO I CAN SEE THE RACE, thank you. Ahem.
Patience, young ones. Christmas will come, eventually.