Here is a collaboration of expert picks, ranging from ESPN's Mel Kiper Jr. and Todd McShay, to Bleacher Report's Matt Miller. I'll give my analysis on whether or not they have made a good choice as well.
Mel Kiper Jr., ESPN (subscription required), Matt Miller, B/R: Derek Carr, QB, Fresno State
Carson Palmer turns 35 this season, and I've addressed the offensive line in free agency and will get my No. 1 pick from last year back. I like the state of the roster, so I'll draft a potential No. 1 who could use a year to learn behind Palmer.
Drafting a quarterback who might not play for a year or two probably doesn't strike fans as a win-now move, but it's the right pick. Keim and Arians can't become so focused on 2014 that they forget their quarterback, Palmer, is 34 years old and has already considered retirement once.
If a quarterback were to be the pick here, it would not be one who is similar to Kevin Kolb. Kolb, the big-armed, semi-athletic mid-major quarterback who could not stay healthy, is skittish in the pocket; that causes his accuracy to wane at times.
Derek Carr is similar in that regard. He comes from a spread offense at Fresno State that forced him to throw too many bubble screens and dump-offs, which limited his development as a pro-style passer. To get an idea of the quarterback he could be, you have to look at his 2011 tape, when Pat Hill was still the head coach and ran more of a pro-style offense.
Carr could be a solid pro quarterback, but the fact is that Keim very likely will not take one this early.
Todd McShay, ESPN (subscription required): Ryan Shazier, OLB/ILB, Ohio State
As we explained in [mock] version 5.0, linebacker is something of a need position for the Cardinals. Karlos Dansby departed in free agency, and his presumed replacement, Kevin Minter, played just one snap as a rookie last season. And Daryl Washington is facing a possible league punishment for an off-the-field incident. Shazier doesn’t possess ideal size for the position but does have very good speed and sideline-to-sideline range against the run.
If you haven't gathered by now, I absolutely love this pick. I think Shazier fits perfectly into coordinator Todd Bowles' defense and is the most likely to replace Dansby and produce as the Dirty Bird did in 2013.
Some are scared off by the fact that Shazier doesn't have an official position leading into the draft. That's an unwarranted fear at this point. All you have to do is go watch film of him at OSU, and you will see him making plays on the ball no matter where he lines up pre-snap. Point blank: Shazier is an instant-impact player who can help out in the pass rush, against the run and in coverage.
Daniel Jeremiah, NFL Network: Blake Bortles, QB, Central Florida
This is ideal for both Bortles and the Cards. He can sit behind Carson Palmer for a year before taking over.
Again, quarterback isn't something the Cardinals should be looking toward with their first-round pick. Ryan Lindley is still on the roster for a reason, and it's not because Arians likes the way he holds a clipboard.
While Blake Bortles would be my quarterback pick over Carr, Johnny Manziel and even Teddy Bridgewater, the fact remains that quarterback is a bad pick for Arizona. Palmer has at least one more season in the desert (he could earn another contract if Keim, Arians and Co. feel comfortable with him after the 2014 season).
Even if Palmer is gone after 2014, you have to believe the Cardinals have enough faith in Lindley and Drew Stanton to give them a shot at becoming the Week 1 starter in 2015.
Note: For what it's worth, this will be really interesting to watch if Bortles falls to No. 20. Arians loves big, tough, mobile quarterbacks with big arms. Bortles doesn't have the best arm in the class, but he's got plenty and can make every throw. His leadership makes him an intriguing pick.
Mike Florio, PFT: Anthony Barr, OLB, UCLA
If the Cards are going to keep up with the 49ers, Seahawks, and Rams, the Cards need pass rushers.
If the Cards are going to keep up with the 49ers and Seahawks, they do, indeed, need pass-rushers—notice how I left out the Rams in that sentence; Arizona did, in fact, finish two games ahead of last-place St. Louis last season. Anyway, I'm trying to be nice in my analysis here, but it's difficult when Florio assumes the Rams are already better than the Cardinals.
Anthony Barr is one of the most overrated players in this year's draft, and it pains me to see someone who should be far more polished as a football player mocked to a team ready to compete for the NFC West title. This is simply my own humble opinion, but of the potential first-round picks at outside linebacker, Barr would be the last one I choose for the Cardinals.
Dan Shonka, Ourlads: Trent Murphy, OLB, Stanford
Cardinals need OT's, a CB and a pass rushing OLB. Murphy is a native of Mesa, Arizona and may be moving back. He is a productive multiple position player who has a lethal inside rip move. He’s planted more than one quarterback after shedding the block and closing on his target. Combines instincts and intensity to rush the passer. A versatile defender who is quick off the ball, explosive, and relentless.
Define "reach": A player picked during a round in which he could be had by the same team at least one round later.
Trent Murphy will very likely be there for the Cardinals at No. 52 in the second round, and should they decide he's the best player available then, he would be a solid pick. Murphy is a violent pass-rusher with, as Shonka pointed out, a great rip move. But he's unpolished as a rusher and needs some fine-tuning. No. 20 is simply too high for the former Brophy Prep and Stanford standout.