Honestly, I hated S1 for that exact reason. I started watching it for backstory on the Legends of Tomorrow characters, got completely fed up and skipped to season two because I'd seen a later episode with the character I just mentioned and liked him. And then his first few episodes sucked me in completely. I suggest trying that approach, if you want to give it another go. It worked for me!
You'll want to start with 2x04 (which ... has its problems, but he shows up at the end). Or you could just watch like the last minute of 2x04 and go straight to 2x05, which is his first full episode.
There's also some important backstory in 1x15-1x16 that helps with understanding the character interactions in season two, but be aware that those episodes still contain the "keeping things from Iris" problem. However, you might want to watch them first, because a lot of things make more sense if you do.
FWIW, the Iris thing completely resolves itself by the end of S1. Later seasons continue to be frustrating for their own reasons, but not that particular one. XD I actually loved season two an awful lot.
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You'll want to start with 2x04 (which ... has its problems, but he shows up at the end). Or you could just watch like the last minute of 2x04 and go straight to 2x05, which is his first full episode.
There's also some important backstory in 1x15-1x16 that helps with understanding the character interactions in season two, but be aware that those episodes still contain the "keeping things from Iris" problem. However, you might want to watch them first, because a lot of things make more sense if you do.
FWIW, the Iris thing completely resolves itself by the end of S1. Later seasons continue to be frustrating for their own reasons, but not that particular one. XD I actually loved season two an awful lot.