I will admit at first I didn't know what to think about the new 52. Then comes along Rebirth, and the jury is still out for me. A few points though:
I don't understand why, if they are bringing in pre-Flashpoint Lois and Clark (with a kid no less), and restoring Terry McGinnis as Batman Beyond, brought back Spoiler and Cassandra Cain as Batgirl, why in the hell they aren't touching / bringing back pre-Flashpoint Wally West (a.k.a. Best Wally). The entire idea of how they are 'fixing' the things people didn't like about the new 52 universe but won't fix that honestly bugs the ever loving crap out of me, especially considering that the Wally West the new 52 has wastes so much about Wally (this comment on r/DCcomics goes into the issues better than I ever could: Why the new Flash Run is bad) .
All of this wouldn't bother me nearly as much if they had introduced the new black Flash (which I actually like, its putting DCs strength having a large number of mantles multiple characters can inherit to good use) as anyone else.
One of Marvel's biggest strengths now was (ironically) losing access to their big 90s franchises, and having to build up B and C Tier franchises to the big leagues. Rebirth does little to address the biggest problem I have with DC, which is that they continue to be the company of the 'Trinity and those other people'. Omega Men has been great, the Starfire solo series has been amazing, and I've honestly liked Grayson. Instead of continuing to make more titles like that which would help diversify their lineup, Starfire is canceled and rolling back into the Titans, Grayson is canceled and going back to Nightwing, and Omega Men is finishing its run and ending (and seemingly not being replaced with anything).
I'm not seeing a ton of things for me as to why, if I had stopped reading most DC comics (especially Flash), I should start now. But it will be interesting to see if their newest round of changes pans out (and which titles get canceled again). At least if they stick to their 2.99 pricing change, it will be more affordable to get titles I wouldn't have been interested in at all at a higher price point.