He could be so much more with that body, but you absolutely can't deny his defensive skills. He's a defensive player who can change the outlook of an entire team defensive scheme when given the opportunity...
I'd rather have a 7 foot shot blocker than a 7 footer who leads their team in charges taken aka "flop"
Jason Collins is, or rather was, an underappreciated defensive specialist. He didn't really help the Nets in anything else, though. However, those teams were in such short supply of quality bigs, that Collins was often their best option offensively and on the boards. The Nets usually scored more and rebounded more when Collins was on the court. Not the only defensive-minded big to be a suspect rebounder; Rasheed Wallace hasn't been much better in that respect.
For 5 seasons, the Nets were one of the best defensive teams in the league (in the top 5 in defensive efficiency from 2002 to 2006). The on court/off court defensive numbers for Collins have been consistently outstanding: from 2003 to 2007, -3.7, -6.0, -13.2, -5.6, -7.5. Almost had a block and a steal per game in his best season, too, to go along with that -13.2. And, yes, he's drawn plenty of charges. He certainly upset Shaq.
One-dimensional scorers receive plenty of appreciation, so why not some fans for the defensive specialists.
There was days where I could reproduce Jason Collins' stat line given the time... I hated when he started for us, but he did really give it his all. Can't hate a guy who just wasn't that good but tried his best to be that good.