There's plenty of threads complaining about the Hexathalon format. Let's talk about we're looking forward to with them! If we don't tell Niantic what we like, in addition to what we dislike, they don't know what to focus on for the future.
I'll start: I like that Hexathalons won't require a central command structure for each Faction. Anomalies have been very hit-or-miss for me based on how organized Dispatch is. I'm looking forward to being able to identify objectives and plan tactics more quickly and flexibly.