MeruMeru is my favorite as well Jayson, but not by a huge margin against the others I enjoy.
I thought all the figures were ok... Neyo was neat because of the new headsculpt for instance. Little stuff like that is enough to make me like new Clones again (I can easily think of 3 commanders I'd love to see redone ala the TVC Clone Wars Commander), but they all had something cool.
Mace was the dud of the wave, but not so much to me because of the choice as I felt his headsculpt and skin color wasn't right. I felt TVC figure was perfect and this was off somehow.
I liked Vizam, he's neat... Any update of the skiff guards from POTF2 is nice to me, as I'd also love to see the Cantina 3-pack updated too.
I find Plagueis to be a fine figure for what he is, but like you said he's someone I'm indifferent towards. I felt the same about Nom Anor. Nice for what he is, but not someone who interests me terribly as a character.
This wave's obviously PT era heavy... So while it's better than 1 and 2, 3 was still not getting me excited about buying it. I liked Meru Meru a little more because of all the PT things I am interested in, Wookiees, Clone Commander resculpts (all decked out if possible), and Office Duel Palps are the 3 areas I'm still interested in. Meru Meru did kind of make the case. The arm swapping is interesting too, to make a more generic Wookiee.
I wish they'd redo the smaller Wookiee Warrior figure from 2005... All the colors too. If it just had knee articulation it would've been a very nice figure for its time.