4v4? You can pull a T4 rush easy even in 2v2. Between Paks and schreks it's really not that hard to hold out.If a person goes T1-T2-T4 in 2v2, he's putting himself in a poor situation. It would have worked last time when panthers were cheaper, but currently? Nope. You're more likely to see OKW panther instead of Ost panther in 2v2.
If someone can do that and still win, either the Allied players made a significant amount of mistakes or the Ost players are very good with the faction.