From what I've seen, in small games he's going to suck. Take a look in the book and read the mosquito totem. Having four, unresistable sources of wiping somebodys entire hand out is ludicrous. That said, this kindof thing only pans out around 50SS. Been meddling with a list that looks something like:
Som'er Teeth Jones 50SS
X4 Giant Mosquito (2x4=8)
X2 Hog Whisperer (2X5=10)
X4 Bayou Gremlin (2x4=8)
X3 Warpig (8x3=24)
All the punch in the army comes from the warpigs - presuming that they don't get focus fired down without a chance to heal, I figure you'd be able to get them in, do damage, and then get them back out again with the totems - as bear in mind, they have a WK/CG of 10/10, and can cast Sooey! which can pull the pigs hopefully out of combat.
Furthermore - every turn, before you go into combat, depending where things are on the table, either eat a gremlin with larva, double them with Git yer bro. Anything that results in killing/sacrificing another gremlin, and then draw six cards off Jones and the two whisperers. Six cards!? The card advantage you can pull in this is disgustiingg. Especially considering that you can do the opposite to the opponents hand. The totems are nippy too. 7DEF with access to all those cards means very little is going to be able to hit them.
Alltogether, I think he's amazing. Don't quite know how he'll do in anything where he has to hold territory though. In a straight deathmatch, he's nuts. But I imagine (On paper at least) the pigs will be too easy to bait away from places they need to be.
In short - At any point you think he isnt doing very well, grab four blank bases and proxy the mosquitos. They break him in all sorts of peculiar ways.