Maul certainly isnt weak, yet he isnt on the level of Dooku in either swordsmanship or force mastery. Beating Jinn and Kenobi isnt anything special really. Jinn was aging and more than likely wasnt at his peak, Kenobi was nothing more then a reckless apprentice. Besides, if I recall Maul lost that match anyway. We dont know how strong Mace was as of TPM, so we cant use that to guage Mauls abilities at all.
Killing Sidious in the EU may or may not have been impressive. I dont know seeing I havent read what happened. But are you sure Maul didnt just catch Sidious by suprise? If so its nothing really that special either - if it was we could say that TPM Kenobi is better than he actually is because he caught Maul by suprise and nearly bet him (in fact he did beat him).
I dont know about this Anoon Bondara person. I find it very hard to beleive that they were the Ordes Finest. Especially when this Order comprised of Yoda and probably Dooku at that time. So while I think Maul is good, he has nothing on Dooku.
EDIT: I dont see anywhere in TPM Visual Dictionary that states Mauls saber skills are better than Sidious' own. Can you provide a page number please.