Personally I find them too big, and I usually go with 1/50-1/48 (others will tell you those are too big and 1/56 is the proper scale) (I think they are wrong because that only takes into account the height of the figures, but not their bulk. Since our 28mm figures have distorted proportions, only vehicles with the same distortions would be the correct size, but then you wouldn't recognise them as what they are supposed to be).
In the end though, if it looks right, it is right.
The main thing is that you make sure you stick with the scale that you chose as putting 1/56 and 1/43 vehicles together on the table will just look weird.