The definition of useless, according to Merriam Webster is:
a : ineffectual <a useless attempt>
As stated, the Celtics have gotten worse as Rondo has taken on more of a role over time - in the regular season and the playoffs. There is a correlation there.
By wishing the Celtics had Rondo and expect the Celtics to win in the playoffs is useless (and it would be ineffective). Rondo's talent does not move the needle.
As far MJ, LeBron, Paul, - Rondo's not them. As MJ, Kobe, LeBron, Paul have taken on biggeer roles their teams seem to have improved accordingly. Don't compare apples to oranges and muddy the water with personal attacks.
It is abundantly clear to many people on here, who are interested in winning, that the Celtics need to make changes and that Rondo has been the beneficiary of the big 3, who have won in spite of Rondo's deficiencies. Rondo has not been able to take up any slack with an aging core - in fact we have continually lost ground. It would lead one to believe that he is replaceable with any run of the mill point guard. If the Celtics had Chris Paul, even with aging big 3, it would be safe to say they would be much better off.
What upsets people is that people want to keep overrating Rondo.
Its like as GK Chesteron said, "My mother, drunk or sober."