Ok, I'm being a homer, but hear me out. I know Gronk is the best at what he does, but let's face it, he's an outlier. He's got unique raw talent and is crazy-athletic for that size. Since he's not a normal TE, the Pats have to pay him accordingly. Plus, he gets injured a lot, and old-school stoic NEers might not like his flamboyance.
Jack Doyle is the perfect TE. He's not the fastest, most agile, quickest, softest hands, best blocker, etc. etc., so he probably won't demand top-dollar for a TE. But he isn't bad, or even mediocre at anything; he is good at everything, including staying healthy. He's like a TE in Madden where all of his attributes are between 80-90, no exceptional qualities, but not a single bad quality. Like a solid 84 rating, just like his number. (I doubt Madden 18 will agree with me, but we'll see.)
Most importantly, Jack Doyle is insanely efficient in his play. Maybe it's just me, but when I watch him, it seems like he is so technically sound that he never has a bad play. He isn't making amazing TD catches like Gronk, but he is making critical 1st-down catches on 3rd and 5.
He is the definition of dependable, possibly the most important trait in a football player. You're hard-pressed to find him dropping a pass, fumbling the ball, or missing a block. He makes me think of phrases like "deceptively fast" or "he's not fast, but he plays fast". His movements are so efficient that it doesn't look like he's really moving that fast, but he always seems to have ideal footwork and leverage, and he creates separation and gets open. And he catches the ball with his hands instead of his chest, and brings the ball into his chest quickly once he's caught it. I would describe his play as "smooth". Jack is obviously not as fast as Marcus Allen, but his efficiency of movement is similar; for such a big guy, you could describe Doyle as "compact" in his movements. Guys like Gronk and Kelce are going to make highlight reels, but Jack Doyle is just that hard-working, do-everything-the-right-way, hometown blue-collar TE that everyone wants on their team.
I'm not saying Doyle is the best TE in the league, but if you're building a team and you have a salary cap, you can't have the best player in the league at every position on your team. You do want solid guys at every position, and Jack Doyle is as smooth, solid and dependable as your Moms' granite-kitchen-counter-top.