Thoughts on Roman's deck: If Luminara and Bariss are 1A for expansion decks you should try, sliding right in at 1B is this 4 armed grievous. Our group loves the 4 arm dynamic. The deck plays right in the middle of the pack.
If you are looking for a deck to print out and play, you've found it!.

Thoughts on Sabrecreator's deck: This deck is too strong. I haven't played it enough to be sure (since after a few games we gave up on it), but I think this deck is stronger than Obi. Personally I don't want my decks close to Obi powerful, or down by Jango for that matter.

Mine is on the strong side, but a strong Grievous is fun. Credit where it's due, it takes, in my opinion, the best elements from Scott's and Rob's deck and from Rich's deck.

About Sabercreator's General Greivous and 2 Super Battle Droids deck: this one was the first Grievous deck I printed; I found it quite well balanced, maybe a bit on the strong side.

Note about my personal tweaks on customs: no tweaks.

About Roman's Grievous, Jedi Hunter and 2 Magnaguards deck: this is the Grievous deck I like the most, probably for its original concept: the changing number of arms comboing with its power combat cards are a great idea and full of flavour. However the deck resulted a bit too strong for my metagame (at least in his original form), so I tweaked it down a bit.

Note about my personal tweaks on customs: Grievous has 15 HP; 'Unorthodox Attack' is A4; Battledroids replace Magnaguards (with relative minor deck swap).

The Geektopia deck is my deck. Raistlin is correct in that it was a bit overpowered, it has been tweaked down.

Romanfarraday's General Grevious is one of my favorite decks, it really feels like Grevious and is unique.

However, I am curious, are the tier rankings based on "one vs one" battles? Because in my group, which does a lot of big battles, Grevious has been played in about 10 games (which admittedly isn't super high), and has "Obiwan-iishly" beaten about 80% of enemy teams/players. Obviously, Grevious's high mobility and attack power are extremely powerful when he has others to hide behind. He does worse when he is the lone guy (again, very well fitting the character of Grevious).

I uploaded a deck that I made of general grievous. I think I don't have the permission to have it listed here. Can someone with proper permissions link it here with the rest of the decks?