Vg's are underrated, but one of the main reasons for this is because they're fitted to zeds... In comparison with Supra/JZ engine cars less people have owned them so know about them as well as some of their counterparts, they've just heard all the horror stories, hence why they're nowhere near as supported as their 6 cylinder counter parts.
They're also v6, which is great for sound but not for working on or maintenance, if you look at the straight JZ it's simplicity and mod support is unrivalled by most. Tbf I never had a problem working on any of my cars- yeah it's a ballache when you drop a socket but it's just more nuts, bolts and hoses, as long as you think the long way round to the bit your working on is the quickest way then there's no time constraint issues.
I've owned 3 2jzgte cars, 6g72, and VG and honestly performance wise there's very little between them, any engine can have good performance with enough money spent but they've all been reliable for me.
JZ's are easiest to get more power and parts for, if a 6G72 wasn't transverse mounted it would have been much more popular (they're not that bad to work on either) and if the VG wasn't such a bitch to work on (in peoples opinion/granted engine bay is tight), their size/weight and people considered them more instead of the usual their stock would rise with their price.
I actually prefer twin turbo's for daily use but my 2nd jz was single turbo and the reason why it's so popular for most? Because it's more cost effective and much more simpler to work on!
It get's rid of a load of crap out of the engine bay and will cost less than a good pair of twins (unless you go for precision, HKS etc) for big power.
And as long as you don't go too big there's no reason why it needs to be really laggy- you've selected the wrong size turbo/set-up if it's too bad tbh.
I've had this debate before- in my opinion Nissan's are the best at styling/mechanical form, Toyota's are the best functioning/put together/simplicity and Mitsubishi were the best at technology/quirkiness.
The ZX is a better car than the GTO whilst I'm on the subject and I owned 2 reliable GTO's unlike most so it's coming from an unbiased perspective.
Also whilst we're on the subject of good engines for tuning- The B204/B234 is one of the best 4 pot production engines ever made in my opinion- stock bottom end good for 600+ t5 mapping system was one of the most comprehensive out there (I had an SE 150bhp and had it mapped to aero spec for £50 to 230bhp!) they'll run all day long and the only thing that really goes wrong is the ignition pack (D.I Cassette). They produce stupid torque which is where it gets let down- the gearbox can't take it... after 70mph they fly but on pull off they're not that quick, just powerful.
The thing is, a car or engine gets jumped and and scene rep/tax is added, you should be grateful that they're not more popular, less z's are broken for their engines and they're more of an unknown quantity, I'd have a VG over an RB any day and apart from the above the ONLY reason why RB's are more popular is because they're fitted to Skylines.