Also I played a bit of co-op via the sign system, and frankly the game is sometimes a bit of a joke 2 player, 1 player it can be a problem though.
I am probably of the minority when I say, I HATE the co-op until NG+. It literally feels like cheating to me and a case can easily be made for it being just that as far as PVE is concerned.
That point aside, I love the invasion/defending multi-player mechanic involved by way of the covenants. The PVP adds layers of "interesting" to the game.
Long story short, I feel like you shouldn't have the ability to summon co-op help for bosses until after your first play-through.
DARKEST DUNGEON -- AEOLUS led DICE, KLYDE and KLUTZ on a quick venture through the Weald ("wooded area" for anyone else aside from me who didn't know). AEOLUS continues to slaughter everything without problem but has become a clepto and steals treasures left and right. The venture was a success without fatality however KLYDE became masochistic once stressed and KLUTZ hopeless.
Back in the hamlet MARIA the arbalest joins the party!
Second trek was into the Warrens. The group was fronted by GLASS and followed by MESH, MARIA and ARVIS. This team proved to be total and utter ranged brutality and thoroughly completed their run without the slightest hiccup. No one even became stressed.
At the hamlet it turns out AEOLUS got donation happy at the church and dropped 1000 of the parties gold and ANDREW the highwayman joined from the stagecoach.
@RANADIEL - Your Marius incarnation will join soon as the "right" class presents itself my friend. If you wanna look em up and pick one yourself I'd be happy to oblige.
@TOMARA -- I like the way you think!! Making you an arbalest and pairing you with my bounty hunter in parties will actually work wonderfully in terms of increasing our likelihood of not perishing while dishing mondo ranged damage. Great suggestion.