The worst effect of the 17th Amendment was removing the ability of the State legislature and/or the constituent Citizens, the People, to remove a Senator from office before the end of the six year term of office. This change and the virtual impossibiity for impeachment or censure of a Senator belonging to the majority party ahs made the senators virtually immune from accountability, especially if and when vote fraud rigs the elections.
Here in Michigan it means that Detroit and Flint elect Levincow for the rest of us.
Senators had 6-year terms even before the 17th Amendment. Once the state legislature elected a Senator, they had no power to remove him before his 6-year term was up.