Review of Durarara!!
Starts off promising, then becomes too weak to enjoy. Although I'd say I enjoyed it overall the first 12-13 episodes are really the best part of the show and that section ends so nicely with great twists that I'm confused as to why it needed another 12 episodes. While the later episodes aren't a total snooze fest like say SAO, they do revolve around sudden love and really expose how lame the mains are in the same fashion. The writers manage to keep you engaged though, with twisty cliff hangers at the end of each episode for a while but they wind up writing themselves intoa corner when you figure out the final conflict could have been solved in minutes with a simple conversation between the mains. They explain this by having them all be suddenly too timid and afraid to talk to each other and it was a tough sale for me. I could have also done without all the love and relationship drama that mostly makes up the last half. A lot of it didn't make sense and it led to a whimper of an ending.
In short, if you can deal with a lot relationship drama and questionable character motives, you might find an enjoyable anime overall. However if that sounds like a turn-off, I could still recommend the first 12 or 13 episodes.