NFL: Which teams draft best?

I decided to check Pro Football Reference for the past 10 years of drafting, to see which teams drafted well or not.



The link above sorts all draft picks by "Career Approximate AV", a measure of how well the player performed in his career. For instance, the top 5 over the past 10 years are:

Rk	Year	Rnd	Pick	Player	Pos	DrAge	Tm	From	To	CarAV
1	2008	1	3	Matt Ryan	QB	23	ATL	2008	2018	129
2	2011	1	1	Cam Newton	QB	22	CAR	2011	2018	103
3	2012	3	75	Russell Wilson	QB	23	SEA	2012	2018	98
4	2011	1	11	J.J. Watt	DE	22	HOU	2011	2018	96
5	2008	2	50	Calais Campbell	DE	22	ARI	2008	2018	94

With a bit of Excel, I grouped all picks (or the top 1200 anyway), and summarised the totals per team and per year; then I calculated the value of each teams picks, compared to all teams that season. This gives the following graph.

Higher numbers mean more valuable picks; everything about the grey line is great, below the blue line is bad. For instance, the Packers were one of the best teams:

Other good teams over the past 10 years were SEA, CIN, PHI, NWE. Some of those may sound surprising, eg for Cincinatti, that was mostly good until 2012:

The worst 5 were CHI, JAX, SDG, NYG and absolute rock bottom: NYJ:

While this all sounds fairly plausible, it is clear that this method gives a higher weight to older years, does not take into account smart drafting (each pick is valued equally) or differences per position (QBs have a longer shelf life, etc).