[svpk]

In my understanding no. Observation of other star systems has shown that ours is somewhat anomalous in being aligned to a plane.

[Terr_]

AFAICT most of the systems we've found with >1 exoplanet resemble our own system, where the planets are moving in roughly the same plane. If you look at this catalogue [0], the "i" value refers to the inclination of the orbit as viewed from Earth, since the parent star's rotation is often unknown. Still, it can be used to compare planets with others in the same system.

The closest I can find to your claim is some stuff from 2010 [1] (many exoplanet discoveries ago) claiming that a significant portion of "hot jupiter" setups are weird.

[0] https://exoplanet.eu/catalog/

[1] https://www.eso.org/public/news/eso1016/

[dr_dshiv]

Source?