After only ONE game? So, after the Broncos-Raider game Monday night, your initial thoughts were "This game reminded me of the 1963 Bronco season." I call total BS on that lame statement! You remembered that the Broncos were sloppy and erratic that year?
Wow, that's quite a memory! No, the Broncos were not a very good football team in their THEIR FOURTH YEAR OF EXISTENCE
However, we did have a few positive high points for the 1963 season:
Most points scored, 50, team record, S.D. at Den.
Most first downs, 27, AFL record, Den. at K.C.
Most yards rushing, 216, team record, Den. at K.C.
Most field goals, 5, AFL record, S.D. at Den.
Longest kickoff return, 90 yards, Charles Mitchell, ties club record, Den. at Houston
There are other note worthy team and individual highlights for the 1963 season, as listed and including the above records in the official 1964 Press - TV - Radio Guide
The next "worst" team in the AFL in 1963 was K.C. 5-7-2
The two teams we beat that year:
Denver 50 S.D. 34
Denver must not have been sloppy and erratic that game! 
Denver 14 Boston 10
Ditto!