I think Kizmet said it all a few posts back (#18 in this thread). I truly like this type of storytelling - it adds a richness and complexity that I would love to see in more titles. When I realized just how far back Solovar had appeared I could only think, "well played M&B!" But, it's not just that Manapul and Buccellato are juggling so many story threads - it's that they do so without taking away from the main narrative, and without negatively impacting the pace of the overall story. If anything, the way they brought threads together in this issue actually added to the pace and made this action-packed issue move along at a speed rivaled only by The Flash himself. I also like the way that, even when the main story arc is resolved, I still have a reason to come back for more, that there are (like in real life) things that are not yet resolved.
The Flash is a great example of what happens when you leave an excellent creative team in place and allow them to fully develop a world around their characters. The idea that this leaves too many things unresolved just doesn't ring true for me. To me, it's what a good title should be.