Depends on what you define in terms of "general Kage level". These current Kages have already been said to be very disappointing in the eyes of Madara, who knew of 1st Hokage, 2nd Hokage and Muu. Therefore if we were to try to rank Kage levels, these Kages would be ranked very low. However, Kages now seem to be elected more on popularity, rather than who possess extreme power.
That being said, Kakashi and Gai (being nice) are very low Kage level shinobi. The reason why I would say very low Kage, still possibly high Jounin, is because I think a few of the Kages would still best them individually. Not to play favoritism, but neither has what it takes to defeat Garra and probably Onoki, who are still considered "low rank" Kages. They only beat Tsunade and the 4th due to fighting style advantages and/or intelligence.