You guys are arguing in circles and you have a few problems with the argument. (Note: I am talking about the range of minis for Dust Tactics and Dust Warfare, not the 1/35 collectibles that Dust also make.)
Short version: Dust vehicle models are roughly 1/48. Dust soldier figures are much larger than 1/48. If you buy other WW2 minis, be careful because they will probably be smaller. If you buy realistic 1/48 model kits, they will probably look OK next to Dust models, but the realistic 1/48 soldiers will be way too small.
First: scales, like 1/35 or 1/48 are only useful if you can accurately measure something. A tank is easy to measure, so it's simpler to make a model kit and check that it's the right scale. A 1/48 tank is very roughly the size of an old Nokia mobile phone. A 1/35 tank is very roughly the size of a couple of paperback books, stacked up. A 1/48 plastic model soldier, standing up straight, is about 35-40mm (1.5 in) tall, and a lot skinnier than a wargames figure. A 1/35 plastic model soldier is about 50=55mm (2 in) tall. Of course, Dust is a made up game, with made up vehicles. They can fudge the scale for them, if they want to.
Second, as lots of people point out, a human figure is very difficult to measure unless it's standing straight up. The figures in Dust are wearing boots and helmets, they are hunched over, their guns are way bigger than realistic WW2 guns would be, and they are on thick plastic bases. What scale are they? I don't know, but they are a lot bigger than the little figures that Tamiya put in their 1/48 model kits.
Third, wargames figures are often described in scales like 25mm or 28mm. That's not very useful, as every manufacturer has a different idea how big that is. Even in the same company, the figures might be different sizes. They are generally sculpted by hand first (although some games companies now design on computer in 3D) before they are put into production. They are often from exciting fictional universes, so the sculptor wants facial expressions, muscles, weapons, poses and gear to be exaggerated. They look cool, rather than realistic. The most popular Science Fiction wargame on the market is generally described as Heroic 28mm scale. In 30 odd years of making minis, that company has slightly increased the size of their figures. There are several WW2 wargames on the market, most claiming to be 25mm or 28mm scale. Their figures are more realistic (but still chunkier than real people, and much bigger than plastic Tamiya 1/48 figures) but their vehicles tend to be smaller than 1/48 scale. Some people call that 1/56, which might be nearer the mark.
Fourth, in a lot of wargames, vehicles and weapon ranges are shrunk so that they can fit more easily on the table top. In real life, a squad of soldiers can fire accurately out to hundreds of metres. A tank gun or a missile can hit a target several kilometres away. Armoured vehicles can move at up to 100 km/h (60m/h) and they can fight at 20-30 km/h (15-20 m/h). So, if you had 1/48 scale soldiers in a 'realistic' wargame, they could be tens of metres apart. You would have to play all your games on full size basketball courts! Also, a more realistic scale vehicle would take up more of the table and block line of sight too much. So, vehicle models and soldier models are different scales in the same game.
Lastly, Dust make models for game play, in what they call their 1/48 range, and for modellers and collectors in what they call 1/35. That's cool because you can make a diorama with a walker and a realistic tank next to each other, and you can use building and other model kits from your local hobby shop.
So here's the answers you have all been looking for:
Dust vehicle model kits are roughly 1/48 scale. If you buy 1/48 plastic model kits, they will look OK next to each other. The exception is for details like machine guns and jerry cans, which are much larger on the Dust models, than they are on the accurate model kits. However, model ranges from WW2 miniatures games may look too small next to Dust models.
Dust soldier models are roughly 'heroic 28mm' scale. If you put them next to accurate 1/48 scale model figures, the 1/48 guys will look tiny. If you put them next to 'heroic 28mm scale' figures, they will look about right. Wargames figures from most WW2 ranges will look smaller than dust figures, although some people suggest that that's ok, because the Dust guys are 'Supersoldiers', which is a nice idea.
Mixing soldier models and vehicle models is where the scale argument falls apart. If you use a WW2 model Jeep in 1/56 or 25mm, or even 28mm scale, with Dust minis, you will immediately see that the Jeep looks tiny. If you can still play like that, and you enjoy the game (because it's just toy soldiers) then good on you! If you can, check out WW2 minis in a shop before you buy a lot of them. Take a Dust mini with you to compare. If you can't, try and search for comparison photos on the net. You might save yourself some heartbreak.
Lastly, scenery, terrain and diorama materials are much easier to run with. As long as soldiers can 'move' through doorways, and fire over low walls and wreckage, then you can be a lot more flexible the scale of buildings and terrain. Just like the hatches on vehicles, and jerry cans, etc, the eye will only see mistakes with human scale things, like doors and windows. A good tip for building your own terrain is to have a couple of toy soldiers handy so you can check that you are still putting things in the right scale for your wargame.