Enough beating up on Tom!!!!

He was a first rate lawyer and a great fixer (e.g. Woltz, Geary, Getting licensed detectives to guard Vito at the hospital in record time). He just was not a
wartime consigliere. His idea f waging wars was to negotiate, and not fight. Of course Sonny was such a bad don that Vito had to end the war by negotiating and comromising on the drug trade. But Michael, without consigliere wiped out everyone.

Also, of all the characters in the trilogy Tom was the only one who got demoted, but simultaneously remained in Mikes inner circle.