I've played Lat a fair bit, and I wanted to offer the flipside of BlackCherries' review. To be clear, I think that review is a valid way of thinking about him, but rather than go over the same points, I'm just going to make a strong argument for the opposite analysis so hopefully the reviews will function as yin and yang.
I think Lat is a good vanilla ID, and the best way to play him is not to worry about his ability too much. Play a standard shaper deck with plenty of events and other easily playable cards, and triggering his ability is really not that hard. There's no need to include special combos, just get used to the fact that most turns the corp's handsize will dictate how many times you draw and how many cards you play out. This is generally not that onerous, and if it is you can just sacrifice your bonus card for a turn.
The corp might choose to do weird handsize things to faff with your ability. That's fine; they usually hurt themselves more than they hurt you. Go ahead and let them play as if they have zero handsize if they want. They're really showing you.
I agree that The Artist is a good card for Lat, but I'd like to highlight the other ability. The option to spend a spare for 2 is good because Lat's ability often leaves you wanting to burn a click without drawing (generally this is a parity problem; it happens when your handsize is even and the corp's odd, or vice versa).
Playing Lat as a vanilla shaper makes Hayley Kaplan the obvious comparison. Both give click compression at the cost of some faff. I won't deny that Hayley is better, but Lat has some advantages. Early on, he feels much smoother - you're not scratting round for s to fire your double installs. And he can play events without them getting in his way too much. I think these factors give him a slightly faster early game. Then there's his . That is very much not nothing at the moment, as IP Blocks and similar are still a common sight, and even taxing the corp a credit when they Hard-Hitting News you can prove crucial.
But Lat's biggest advantage over Hayley is one that goes outside pure strategic analysis. He simply takes much less brain space for the player. I took him to a small tournament for that reason and he was solid. I firmly believe that not having to process all Hayley's combos and options helped me to avoid burnout during the later rounds.