They did have drop problems.3rd most in the league for any QB. 6.2% of attempts per PFF which was 5th highest in the league.One of many issues. Protection, run game, WR 3/TE performance more so than drops.
And compare to Tony Romo. 2.3%. A 4% jump in comp % if he had Romo type drop %. Stafford would have been at 64.5% and then you all would shut your mouths.
According to the link Lions were 20th in drop %
Again shows the problem with drops, subjective.
If he had 0 drops he would have 64.3, rank him behind Bridgewater (This is including Vikings teams drops) If he had the same drop percent as Luck he would be 58.1% Tied with Carr for 30th.
So even if everyone around him didn't drop a single pass he still wouldn't crack top 10 in completion % even with the unfair stat skewing of only eliminating Stafford's drops.