Reading the forums through and trying to find build videos on youtube I did see a fair amount of the SMG/Spec Ops builds and was interested in trying that for my first time, but I also saw talk about it being nerfed with a patch. Is it still viable? I only picked up the base game and the only updated SMG build I could find said the expansion was required for it.
SMG has been nerfed somewhat, but it was a very powerful build to begin with. It's still a powerful build.
I can easily recommend the SMG Commando build for first-time players. It's very intuitive, and I almost ran with it for my first playthrough because it makes sense thematically. You basically play as if you are Blade [with the SMGs] or Kate Beckinsale's character from Underworld.
As explain above, you used to get 'special attack' damage bonuses for having a 'smart module' on your SMG that gives bonuses to said 'special attacks.' Styg nerfed that, by making bursts not that kind of 'special attack' anymore.
So what that really means for you is that instead of building your character based on doing extra damage from SMG bursts, you instead try to raise your "critical chance." You go for a "critical build." In practice, that means putting things on your SMGs other than the now-useless Smart Modules, not using the Smart Goggles anymore (use the ones that give critical damage bonuses), and doing whatever else increases critical hit chance.
Your grenades + grenade feats will carry you through a large part of the game, dealing with small groups of enemies. The SMG Commando is an excellent synergy between stealth and dexterity. You will get several bursts per turn, eventually, because of high DEX. And those DEX attributes will give you good lockpick, which is useful for novice players. The stealth means that you can basically 'decloak' near an enemy group and lay into them with SMG fire + grenades, and then use your Sprint to hide behind a corner. You basically always want to keep enemies within good burst radius, and don't let them get to sniping or knifing distance. It's a dance. And you can kite enemies.
Since the SMG Commando build only needs a few feats, you will have additional room to add your own quality-of-life feats, such as Pack Rathound, Clothier, Skinner, and getting out of entanglement. It's a really great build for new players.
The only thing that might be even more effective is a sniper / SMG hybrid character, but that's more complicated and requires a better understanding of builds. SMG build isn't complicated. [Don't use it on Dominating difficulty, though.]