This is bad obviously, but compared to other Midterms this is actually a pretty weak gain for the out-party, especially with the President's approval under water. But as you can see don't expect Dems to hold the House here. They only need to lose 5 seats to lose control. The Senate is looking better.
Biden's net approval at this point is -11.7%.
Trump lost 41 seats in 2018 with a net approval of -10.3% on election day.
Obama lost 13 seats in 2014 with a net approval of -11%.
Obama lost 63 seats in 2010 with a net approval of -4%.
Bush lost 31 seats in 2006 with a net approval of -25.1%.
Bush gained 8 seats in 2002 with a net approval of +32.6%
Clinton gained 5 seats in 1998 with a net approval of +33%.
Clinton lost 54 seats in 1994 with a net approval of +3.5%.