This draft class is not very strong at WR compared to the last 3 drafts. There are several fantasy WR 2 upside players but in my opinion only one (Corey Davis) who has WR 1 upside.
A fantasy WR 2 is still valuable, just not a player that would be worth a top 5 rookie pick (where you are selecting).
I agree with what others have said. If you are focused on upgrading at WR try trading the 5th overall pick for a veteran WR that you like.
FWIW here are my rookie rankings for 2017
Tier One
(5) Corey Davis Titans
(41) Dalvin Cook Vikings
(8) Christian McCaffrey Panthers
(4) Leonard Fournette Jaguars
(48) Joe Mixon Bengals
(22) Evan Engram Giants
(17) OJ Howard Buccaneers
(29) David Njoku Browns
Tier Two
(7) Mike Williams Chargers
(9) John Ross Bengals
(37) Zay Jones Bills
(86) Kareem Hunt KC Chiefs
(62) JuJu Smith-Schuster Steelers
(89) D'Onta Foreman Texans
(67) Alvin Kamara Saints
(114) Samaje Perine Redskins
(40) Curtis Samuel Panthers
(69) Cooper Kupp Rams
(72) Taywan Taylor Titans
(12) Deshaun Watson Texans
(10) Patrick Mahomes KC Chiefs
(2) Mitch Trubisky Bears
(52) Deshone Kizer Browns
(44) Gerald Everett Rams
(82) Carlos Henderson Broncos
(84) Chris Godwin Buccaneers
(117) Josh Reynolds Rams
(134) Jamaal Williams Packers
(143) Marlon Mack Colts
(132) Donnell Pumphrey Eagles
(100) Jonnu Smith Titans
Tier three
(45) Adam Shaheen Bears
(110) Dede Westbrook Jaguars
(144) George Kittle 49ers
(79) Ardarious Stewart Jets
(121) Joe Williams 49ers
(182) Aaron Jones Packers
(140) Wayne Gallman Giants
(150) Jordan Leggett Jets
(87) Davis Webb Giants
(201) Bucky Hodges Vikings
(162) Jeremy McNichols Buccaneers
(143) Jake Butt Broncos
(154) Jeremy Sprinkle Redskins
(174) Eric Soubert Falcons
(237) Isaiah Ford Dolphins
(242) Elijah Hood Raiders
(249) Christopher Carson Seahawks
(UDFA) Matt Breida 49ers
(215) Brad Kaaya Lions
Watch list (Players I haven't evaluated listed by the order they were drafted)
(96) Kenny Golladay Lions
(98) Chad Williams Cardinals
(104) CJ Beathard 49ers
(105) James Conner Steelers
(106) Amara Darboh Seahawks
(117) Mack Hollins Eagles
(119) Tarik Cohen Bears
(127) Michael Roberts Lions
(128) Josh Malone Bengals
(133) Ryan Switzer Cowbos
(135) Joshua Dobbs Steelers
(139) Jehu Chesson Chiefs
(141) Chad Hansen Jets
(156) Brian Hill Falcons
(166) Shelton Gibson Eagles
(170) Rodney Adams Vikings
(171) Nathan Peterman Bills
(172) Isiah McKenzie Broncos
(175) DeAngelo Yancy Packers
(177) Trent Taylor 49ers
(179) TJ Logan Cardinals
(188) Elijah McGuire Jets
(203) DeAngelo Henderson Broncos
(207) Brandon Wilson Bengals
(209) Robert Davis Redskins
(219) Stacy Coley Vikings
(226) David Moore Seahawks
(238) Devante Mays Packers
(239) Noah Brown Cowboys
(241) Khalfani Muhammad Titans
(247) Malachai Dupree Packers
(251) Mason Scherck Bengals
(252) Matt Dayes Browns
(253) CHad Kelly Broncos
Latest
rookie poll for a more consensus view of voters in the SP