Looking for good Let's Play videos.

You should look up Achievement Hunter, part of Rooster Teeth. Their LPs are pretty funny.

ChaoticMonki he can be very serious and play for hours.

Apart from TheYogscast (which is not only Minecraft, check Sips/Hannah) and CaptainSparklez (minecraft), I like SplatterCatGaming , BrenyBeast(lots of minecraft though) , SageMaster15 and Etalyx (more reviews and "let's look at" but he's really good. . Good videos, good commentaries, not enough time to watch :(

RockLeeSmile showcases 1 Indie Game everyday and does a few let's plays as well.

northernlion

nerd3

both are pretty good. Neither tend to do full lets plays but more of a lets look at style.

LET'S PLAY!

Check mine :3 , also I'm a kurtjmac fan.

I like SideStrafe i joined his community when he did some DayZ vids back in the day, he likes to bring quality content, but he's more focused on having fun, yet, his commentaries are good enough and interesting to hear, check it out if you want

Search for gamerfreak's channel on youtube

http://www.youtube.com/channel/UCNAiTZSPD3gCiGM6-AhJFGw

You are contradicting yourself when you ask for Let's Plays to care about immersion, because Let's Plays are essentially people talking over the games. Instead watch a walkthrough and let the game do it's job. You don't watch LPs for immersion, but for the characters of the Let's Players. Giving back stories is giving you more information, but is not drawing you into the game, because it's still some unofficial source talking over it.
Anyway, I don't generally watch them, but since I'm away from a PC for awhile at the moment I've dabbled into some. I can recommend Northernlion who singlehandedly rekindled my interest for the Binding of Isaac. And Jesse Cox always manages to give my day some positivity whenever I watch his stuff.

The Let's Play Archive is the place to go for the finest let's plays. Don't let anyone else fool you, Something Awful let's plays are the best ones, and most of them are archived there.

Also let me plug a friend, PerochialJoe, who is a very cool duder. Have fun. :)

Yogscast and TotalBiscuit are my favorites.

dis

ChipCheezumLPs Mostly Metal Gear series, but a few other games as well. Very competent and entertaining.
Slowbeef I particularly enjoyed the two Dead to Rights games.

I used to follow the Yogscast but I stopped watching their content a long time ago. They are generally not very good at videogames and their videos are too much on the immature side for me.
Something similar applies to Nova: while he's more entertaining than the Yogscast, if you don't want a scream/stupid jokes channel you can safely skip that.
Totalbiscuit's content is generally good quality, if you are looking for a gaming journalist and not a letsplayer (meaning that he doesn't letsplay at all).

I'd recommend theRadBrad

You should give davidr64 better known as "X", a try.
Maybe watch his Dishonored series, I imagine you'd like that after watching Gophers stuff.

He is a decent gamer, which is always nice to see, and sadly kinda rare in the Let's Play world, he tries to immerse himself just as much as Gopher, doesn't necessarily go into that much detail with his characters though.
I feel like Gopher has a slightly annoying habit(that i won't go into in case you didn't notice it yet and me telling you ruins something for you.. :D) X has also one habit that might be pretty annoying, but if you can get past that, you will be in for a fun ride.

He uploads when he feels like it, which usually translates to "If he uploads, he uploads daily, if he doesn't, it can take months until something new comes"

Edit: Oh, he also had a Oblivion series that you might want to watch, it's left unfinished, and was a project he livestreamed.
It's not quite the same as the rest of his content, definitely entertaining though.

Used to watch Mangaminx. She screams, but it's usually hilarious.

Check out http://www.gameanyone.com/ :3 It's better than youtube for let's plays and walkthroughs. I promise. <3

the only ones i watch regularly are pbggameplay and superjeenius. superjeenius's persona lets plays are awesome but he just moved to japan so his uploading is kinda screwy atm. and pbg is pbg

So many answers... none even mentioning TheSw1tcher's channel, or their video series on Machinima called Two Best Friends Play. These guys are rarely not funny for me. Pat & Matt is the shit, go search for some of their videos.

I remember watching some FrozenFoxy guy a while ago, he seemed pretty good.

CallMeKevin, Utorak007, Northernlion, Zer0Doxy, Seananners.
Reason: I enjoy watching people who ignore the fact that they're recording (unless they're playing alone)

If you want to watch live streams, you can check out Twitchtv also. They have a lot of games played live.