Washington is an 11-year veteran that operates best as a #3 option in an offense. He will be 33-years-old when the season starts and stands at 6'0, 180 lbs. He is coming off a 658 yard, 4 touchdown campaign on 47 receptions, and has averaged 800 yards per season over the past five years.
The fact that Washington spent time in the Texans offense under head coach and former Patriots offensive coordinator Bill O'Brien should help the receiver acclimate to the Patriots.
Washington plays both in the slot and outside and he is dangerous down the field. While he's not a burner, he has historically been asked to attack the deep area of the field out of the slot.
The Patriots have already added receiver Chris Hogan from the Buffalo Bills, and also have Julian Edelman, Danny Amendola, Keshawn Martin, and Aaron Dobson under contract.
The addition of Washington shouldn't spell the end of Amendola, but it would certainly lessen the blow if Amendola won't restructure his contract. Washington has been far more successful over the course of his career (Amendola hasn't had a 700-yard season in his career).
I expect Washington to compete for a spot on the roster and that he will not be a lock to make the team.