LGD is very very strong. The match vs Tongfu was more because, imo, Tongfu didn't play to their full strength. Fail ravage and epic centre was just mistakes they shouldn't be making, anyone who watch the game will understand what I mean.
But, against Ehome's lineup with Naga, Panda, Engima, LGD took the game very convincingly. Sure, Ehome could do better in some of the early teamfight when Naga set them up. But what's really scary of LGD is this, once they get an advantage, they compile it. It's fucking hard to fight back against these guys, they take so little risk and they leverage their advantage so amazingly well.
LGD is top tier.