Thread got closed before I could post, I'll leave it here
DR and SR are both very flawed.
1. The penalty system is often wrong
2. It's too easy to gain SR in race C.
3. It's too easy to gain SR in lower ranks. SR.E gets a massive boost shooting you up to SR.B in a single race.
4. DR resets are no deterrent when winning is all that counts, it only makes it easier.
5. Lower SR also often gets rewarded with easier races.
6. Penalties have little impact and are far too easy to get rid of.
It all leads to rewarding aggressive driving. The only incentive to drive clean is a meaningless 50% clean race bonus.
DR and SR should be track / race combo related. Take a look at my DR graph since the weeklies started with Sainte-Croix
I mainly race without qualifying, and I race a lot while concentrating on one race/car combo per week. That gives the system plenty time to adjust my DR for each car/track combo. (A daily B naturally means lower DR when racing without qualifying due to less time to gain positions)
Most dips are not DR resets, the only DR resets up there are in the Bluemoon Bay week, draft bumping (or rather getting draft bumped) puts you down in SR.C in no time. (Especially since it was a daily B only worth 5 SR)
So what's my true DR ???
DR/SR per track would help with better matchmaking.
Averaging SR over time would help with better matchmaking, keeping the contact happy out of SR.S.
No DR resets would help with better matchmaking, keep the aggressive fast drivers together instead of mixing them among the slower drivers. (Where easy poles guarantee easy SR gains)
Deducting SR for reckless driving (scraping walls, spinning out, going outside track limits) would help with better matchmaking.
Serving penalties in the pit or added at the end will make races more safe.
Requiring (consecutive) clean race bonus to level up to the next SR tier will make higher SR mean something.
Fixing the penalty system would help as well of course. However it's been 15 months now, I think that ship has sailed.