but the thing with the droids on the federation ship is that there weren't a whole lot of them, just a few. In addition to that, they were taken by surprise. In the arena, there was a whole lot of droids, just like there were a whole lot of people with drawn blasters in front of maul. Besides, droids are droids. People are much much better than droids. That is one of several reasons the clone army won so easily in AOTC.
This plus Lama Su said: "Clones[and/or people] can think creativly. You will find that they are immensly superior to droids"
Droids are for a lack of a better word, stupid. Even Dexx and Obi Wan have a chat about how droids don't have any wisdom in AOTC.
I guess what i'm trying to say is that the People with blasters to sith ratio was pretty high, just like the droid to jedi ratio was high in the arena battle. Since so many jedis died in the arena, i believe that maul would have too.
Also, even if Maul would have been able to deflect all of the bolts, Obi Wan and Qui Gon could have taken him down right then. I doubt that Maul can do fight Obi Wan and Qui Gon AND deflect blaster bolts at the same time.