Bottom line Skins are rebuilding and there are still questions at Offensive Line, TE, RB and one WR position. WIth all those challenges, it's not wise to count on Haskins to be a starting caliber FFL QB this year. However, according to the "eye test" and not "simply stats", Haskins appears to have potential so is maybe worth picking up very, very late or as a FA because you never know he may just emerge.
I am strictly a redraft guy, so I think that's where the disconnect is. As you say in your first sentence above, the entire O has questions, with the exception of McLaurin. Let's look at some FBG ADP's for the WAS players (I chose PPR over non-PPR, as that seems to be more the norm now):
QB - Dwayne Haskins (19.4, pick 220) = QB31
RB - Antonio Gibson (9.11, pick 107) = RB40
RB - Adrian Peterson (11.10, pick 130) = RB46
RB - Bryce Love (16.1, pick 181) = RB56
WR - Terry McLaurin (5.12, pick 60) = WR23
WR - Antonio Gandy-Golden (21.4, pick 244) = WR73
TE - No WAS TE's are named, but the ADP list only goes to pick 25.6 (294)
K - Dustin Hopkins (22.2, pick 254) = K20
D - 23.7, pick 271 = D27
Sure, some of the guys above will finish better than their ADP, but they are starting so low, you still wouldn't want them in your fantasy lineup. If Haskins finishes QB24, that will be considered a win, but not as your FF weekly starter. Let's face it. Rebuilding is just a kind way of saying, "we suck right now, but hope to be better some day". Teams can remain in the rebuilding phase for decades.
