There were so many ridiculous things that happened last night, saying Arrow has "jumped the shark" is not too far off.
Having Laurel use a magical voice box that sounded like Sara's voice when she was on the phone with Lance was one of the creepiest, silliest things I've ever seen on Arrow. Then, when she's on the fire-escape talking to him later, it was hilarious to watch Katie Cassidy "lip sync" with Sara's voice. The lengths she and Team Arrow have gone through to keep Sara's death a secret from her own father is truly disturbing, at this point.
Then, there is Oliver's survival. I HAVE to believe that they're going to double-back soon and explain exactly what it was that brought him back to life. If they don't, then yes, Arrow has jumped the shark, and they have also nuked the fridge.