Now that the line has gotten past a touchdown, I'm going to get involved with Washington. 
There are a number of below-the-surface factors that point to Washington keeping this game close. Washington is better coached this season, hasn't shown any quit and ranks first in the league in sacks. Washington also is No. 1 in Football Outsiders' DVOA defensive ranking, a metric that measures a team's production versus league average. 
Washington's offense is learning a new system. Improvement should come each week. The Browns get back cornerback Kevin Johnson and linebacker Mack Wilson. However, they will be without cornerback Greedy Williams, Olivier Vernon,, their second-best pass rusher, and star cornerback Denzel Ward is questionable after injuring a groin muscle in practice.  
Terry McLaurin is Washington's one dangerous playmaker. He could be set up for success if Ward can't go. Washington knows its offensive limitations. So they've centered their attack around throwing short passes to their running backs. This could work against Cleveland, which remains thin in the secondary. 
The Browns have not played well on special teams. They have one of the more worrisome kicking situations. 
Bottom line is the Browns, who are 12-25-1 ATS in their last 38 home games, just aren't a strong enough overall team to lay this many points against a feisty underdog.