I liked the looks of, Hog Wild, but outside of Ulix and pigs, I'm not particularly fond of the Gremlins faction.
I wouldn't recommend Gremlins then. This is absolutely a game where expanding into the full faction is rewarding.
Although, Zoraida did catch my attention with her critters and voodoo magic, and she seems interesting as a character.
She's quite fun (and stronger now that Will O's are in the game), but can be tricky to pick up.
However, I've been heavily considering just jumping to another faction, the Outcasts specifically. Leviticus' Abominations are gloriously grisly, and I'm always a sucker for the mad sciencey types, Von Schill is, well, Von Schill, and Jack Daw was one of the main competitors for what my first box would be. I'm just not sure, as almost every faction is dead even on appeal. Please help me Dakka, you're my only hope.
As an ex-Outcast player, they're a fun, diverse faction.
Von Schill is a solid master with a pretty well-rounded crew. The real trouble will be finding a second Freikorps Trapper.
Levi can be quite fun and strong. I do not agree with the above comment about needing half of the Arcanists. You really will only ever use Ryle, The Mechanical Rider (plus Metal Gamin, most likely), Necropunks/Stitched Together, and little else out of faction. You can play Levi purely in Outcasts and do quite well.
The Viktorias are lots of fun and can be quite versatile. Learning to do their slingshot takes practice though.
Jack Daw is another solid master, especially with the new The Bigger They Are upgrade. He runs quite well with just about everything, especially models that just like a bit more mobility, such as Sue. Montressor just got a buff as well.
Hamelin can be quite strong. He really only needs his box + the Brotherhood of the Rat box. He can also hire Candy, Baby Kade, Iggy, and Crooligans, but Crooligans might be the only one of those you use.
Parker is new and quite strong. If you've ever wanted to build a fort on the board out of bullets, he's your man.
Tara is probably my favorite and can be fun. She focuses on being able to bury, then slingshot models up the board. She can also hire Death Marshals, which are awesome sculpts.