Paul Inouye clearly states in the
post that "
One variable that is set by winning or losing is the WinFlag" which seems to imply that there will be more than one variable used in the calculation of score. Hence, it will not be based on just win / loss.
I believe that the main gist of your post is that based on the numbers provided in the example it
may be very easy for a player to drop from 1300 to 0 particularly new players and take a while to climb back up to 1300. However, I'm not really sure I see the problem per se.
The likely trend I would expect to see (at least initially) is that new and (most) casual players who solo PUG are going to be clumped below or close to the 1300 level. The more serious / skilled players who solo PUG will be above 1300 as well as those who mainly premade (whether casual or serious).
In the long run, new players and below average players (due to technical / inherent disadvantages) will be in the lower band, most average players will be in the middle band and the better players in the upper band.
Any player wanting to play against the higher rated players will either have to up his / her skills if mainly solo PUGging or join a premade.
To sum up, solo PUGs will by default get the (almost) solo PUG queue they want mixed with some pretty bad premades (skill wise) while the premades will get the competitive matches they want.
As far as griefing is concerned, there's not much that can be done to stop anyone from smurfing other than what already exists currently. Better just
some asshats griefing than having hugely mismatched battles i.e. stomps which appear to happen very frequently currently based on anecdotal evidence.
Assumption:
Generally, Premades win between 50+% (lowest I've seen on forum is actually 65%) up to 80% - 90%. Conversely, solo PUGs win about 30% - 40% of the time.
Figures derived from forum posts and is broadly consistent with my own experience solo PUGging and casual grouping.
P.S. The main issue I expect to occur due to ELO is the intentional losses through botting, suiciding, afk for smurf accounts created specifically to average down team ELO scores.
Edited by p4r4g0n, 31 January 2013 - 04:21 PM.