Digression: I know there's a lot of discussion about the impact that IFComp has had on the kind of IF offerings available from the last decade or so, and I'm glad that the XYZZY Awards and Spring Fling and ParserComp and other contests are around as well, but I really like this size of game: 10-20 rooms, can be played through in an hour or two. It's easy to keep the geography in your head and you can play through it in one sitting after putting the kids to bed.
Taco Fiction seems like a trifle: it's comedic (and quite funny), and the plot is as light as it could be in a game where you can point your gun at anyone you meet. That seems like sort of the point though; this game could have been quite bleak; the PC is desperate and doing desperate things. There's nothing in the game that needs to be funny, but the comedic touch lightens the tone enough to make it consistently compelling.
The world of the game is quite detailed, and actually becomes more of a playground for the player than it seems at first. A straight walkthrough to the best ending would miss about 75% of the content, so it's worth your while to just wander around, talking to all the NPCs and trying out different activities. There are a couple scenes that I found particularly well done (Spoiler - click to show) -- the charades and the Star Wars story are delivered perfectly -- and your initial entry into the taco shop is one of the tensest and most unnerving scenes I've played in any IF. (Spoiler - click to show) Consider the clear uneasiness of the PC from the first moments of the game, the litany of actions that you're going to take, that disturbing painting which catches your eye as you walk in, then the masterful revelation about the bikers. It all functions exquisitely to ratchet up the tension. There are no really difficult puzzles here, just a lovely little game about crime.