Episode II doesn't make Jedi weak. Rather, other Jedi strong
I like Episode II alot. Especially the arena scene. In this scene we are shown that not all Jedi are gods who can't be killed.
This doesn't make them weak however, there are something like 10 droids to every 1 Jedi.
I like the scene because it shows that Yoda's line of Jedi (Dooku, Obi, Qui-Gon, Ani) and a few others are the strongest of the Jedi, it emphasises their power compared to other Jedi.