While I do agree with Luos that stuff looks nice with the new tonemapper, incl. Effects, I also strongly agree on the fact that its less than ideal to not be able to have a pure red surface that also has red bloom anymore. The problem with ACES is that it treats values above 1 completely different from the old tonemapper which is causing exactly those issues. I am not too sure though if those could be fixed fairly easily :S Although, I would like to see something similar to the ACES tonemapper that still handles those cases a lot better! 
Cheers!