I'd recommend this. It's worth noting that easy mode is extremely easy so that may affect gameplay, but that shouldn't affect the story mode. If anything it's the reverse, since if you're more confident in not dying then you should be able to explore the city a bit more, find more audio logs etc. In addition a lot of the story's impact is felt in the second half of the game, so it's worth persisting imo. That said, the unbalanced nature of the story was one of the game's biggest flaws.
The second half is a boring poorly paced mess, save for a decent ending. Once the major twist happens, there is little reason to slog through it. The first half is waaaay better than the second, so I suppose you're half right.