People who said IV car handle like a boat might be just trying to look smart . And I'm seriously doubt they even know how boat actually handle, neither does they ever drive one.
You mean people like Dan Houser? Afterall he said himself. Also, I think they handle like boats. As in, oftentimes the the circle of turning was wider than one would want/anticipate which can be very frustrating at times. Do I like GTA IV's driving physics. Yes. I think they work on a small map but I still need they could be better. Somewhere between IV and V would be perfect. If IV is Forza then I want VI to be like a Horizon game. Fun, fast but also takes skill and concentration but is not too punishing.
Also, I know how boats handle. Been sailing since I was a kid: Optimist's, Folk Boats, Mirrors, Leisure 17 to bigger as well as using old punts and rubber dinghys.
And to add more, even boat and car in IV handle very different
Also, I don't think anyone is saying cars are boat-like in IV, therefore boats and cars in IV handle the same. They're just saying cars are boat-like as in the turning circumference can be very wide and it can be a nightmare taking tight corners at speed.
Before someone tries to suggest that I suck at the driving that seems to come with criticism over GTA IV's handling, that's far from the truth. I've generally been a fan of driving games all my life from Outrun to Lotus Challenge to TDU, MC:LA, NFS: series, GT and Forza. Driving is actually one of things I'm semi-decent at in competitively in videogames. I enjoy driving in IV. I do think it needs improvement though. For me it's 80%-90% near perfection. Actually, would have been lovely drive cars with IV's physics through countryside and around some winding roads and hills.