I have been playing an "all ranged" party.

High Elf Fighter using only Bows, Gale, Wyll and Shadowheart. It's certainly interesting without any sort of ability to Melee people. We're all halfway to level 4 at the moment. There have been no downs yet. Gearing up to do Minthara and Gut. Overall I would say it is easier than some of the more gimmicky things I tried in Patch 5 - AC cleric, melee wizard, "revenge warlock" (killing things with AoA and Hellish Rebuke)

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I will also second enemies using Dash superfluously including examples of Mages using dash to run into melee range.