If you really want to experience the true greatness that is TLOU 1 then just play the game and then if you must watch this afterwards just for comparisons sake.

The show despite copying a lot of the games story just doesn't do it justice in terms of portraying the emotions and bonding between Joel and Ellie, as much as I like Bella as an actress she just doesn't fit the role of Ellie well, she looks nothing like the game character and despite using some of the same dialogue she cannot convey the same emotional connection and depth as the game character along with the voice of Ashley Johnson. I think Pedro was ok as Joel, he looks a lot more like Joel than Bella does Ellie and even though his acting was fine he is still a far cry from the game character though not as far off as Bella is to Ellie imo.

The show also skips a lot of what makes the game great, the infected for example are few and far between and even though they cannot be used as much as in the game for obvious reasons they are still severely lacking, they change little things here and there for seemingly no reason (another example there are no spores in the show, a big part of how the infection spreads and sticking with bites only which is a big shame if you understand fungus at all)

Overall the show is just mediocre, the acting is ok not great, some of the CGI is good not spectacular, the cinematography is done well though and the set pieces are fine, again all things considered it's just so middling.

So TLDR, just play the first game, it's a masterpiece and this show is anything but.