Viney and floppy growth is typical of a lot of OGs, some sort of support is usually neccessary like trellis net, tomato cage or bamboo stakes or the branches will start collapsing when they get some bud weight.
Yes, this is definitely true of the OG. I've been growing it for about 6 years. Some tips that can help you strengthen OG's grow structure are:
1-run your veg metal halide bulbs longer than normal into flowering for the first two weeks of flower or until you start seeing buds starting to form, then switch them to the HPS bulbs. This will help keep the internodal spacing closer together and grows more squat, stronger limb plants.
2.-keep your night time (lights off time) and daytime (lights on time) temperatures close together with not more than a 5 degree differnce in ambient room temp. This will also create a tighter internode spacing and a squatter, stronger plant.
3.-Use a silicate additive early in veg growth. This will strengthen the plants cell walls.
4.-keep your metal halide lights/shades down low on your vegging plants to promote a stronger more squat plant growth
5.-keep constant air movement in the room. This encourages stronger stock/stem growth