I wouldn't say Eli has had a substantially better group of receivers over the years. This year was rough for Flacco, but outside 2015, I'd say Boldin, Smith, Sr, Mason, his TEs in a healthy Pitta, Daniels, Heap etc have been relatively on pat with what Eli has had. They are very similar QBs in very similar situations. Those saying otherwise likely look at Eli as having been sorta average at the QB position and certainly don't want to liken Flacco to that category/ranking.