64 Rec, 956 YDS, 14.9 YPR, 8 TD
90 Rec, 901 YDS, 10.0 YPR, 4 TD
47 Rec, 687 YDS, 14.6 YPR, 7 TD
47 Rec, 624 YDS, 13.3 YPR, 3 TD
44 Rec, 494 YDS, 11.2 YPR, 4 TD
Those are the stat lines for the first 5 WR's picked in last year's draft. It's clear that the first two are the #1 WR's on their team, while the rest are slotted in as #2 or #3.
Unless you're a fantasy football person who digs into stats every day, most of us probably couldn't guess the order