I don't think they're too much alike.
Marvel seems right now like its gripping at straws as if it was a new company trying to make or break its entire business. They've got a bunch of hectic stories going on that seem to be just confusing their fans (ie Civil War, Annihilation, WWH, Skrull Invasion) and trying to win everyone back at the same time. No offense to Marvel...ok maybe a little, but Civil War was a disappointment lol.
DC right now seems the opposite. They seem to have a large quantity of straws to grasp at, but can't figure out which ones they want to. With the reboot from the Infinite Crisis, they could've brought it back to the basics, but they've been having a real beat down in terms of heavy hits lately. Right after Infinite Crisis, they give us 52. Right after 52, we get WWIII. Right after that, we get the information that there's Countdown, Amazons Attack, etc etc etc. Whereas Marvel seems to be having just about as many events, DC seems to actually know where they're going with it instead of just competing. Bart Allen's death didn't seem 100% planned to me, but most fans that I've talked to that are following DC's events all have the feeling that its building up to be a giant "IC --> Countdown" story, while Civil War, Annihilation, and WWH just seem to be coexisting rather than intertwined.
DC is becoming more like Marvel in that they're becoming darker and taking on some grit (Sobek's meal, anyone? Lol) but I don't feel as if the two companies are close enough to each other that you could say they've become too alike. We'll see what the consequences of all these events have to do with it, though. Who knows. Maybe a year from now, we're going to see DC more like Marvel and Marvel more like DC.