Lackluster quarterly results from a few big tech names and other mega-cap stocks pulled markets down today. Still, a post-earnings drop is often seen as a buying opportunity for traders and longer-term investors alike.While heightened market volatility can be nerve-wracking, a spike in either direction is not abnormal when companies report their earnings. That said, LendingTree (TREE)  and Royal Caribbean Cruises (RCL)  are two top-rated Zacks stocks that are very intriguing as their Q2 results approach on ...