Book reader community.
I did find the mountains of madness very boring. I also loved the tomb and thought Herbert West - Reanimator was also very good.
Some of his stuff is way better than others, so if you're not vibing with one story, don't feel bad about trying another!
Some other good reads are The Nameless City and The Picture in the House.
I kinda feel the same. I've read mountains of madness before, and can remember some of the imagery of the horror he describes, but for the life of me I can't remember the plot or characters. Lovecraft has interesting lore and vivid imagery of his eldritch horrors, but I haven't been able to connect with any of the actual stories.
Lovecraft can be very... dense. At the Mountains of Madness is kind of jumping in the deep end of the pool too.
Try something like "The Statement of Randolph Carter" or "Cats of Ulthar" to get your feet wet.
Mountains of Madness works better if you are already sort of "into" his mythos. Starting with shorter things and deciding if you like them is a good idea, and a lot of the themes in the longer works are easier to digest starting with shorter ones. That said, Lovecraft absolutely is not for everyone, so no reason at all to find that you're more turned off by his work. If you don't have the same sense of a vague fear of the unknown and unknowable, his "horror" will flop with you, and given how tremendously xenophobic he was, that might be a good sign for your personality.
I found a super cheap compendium of his works on amazon just scrolling through available titles with my Kindle a long time ago (I believe it's The Definitive HP Lovecraft by Halcyon if you go looking), and it does a good job of starting out with some shorter "easier" reads like The Nameless City and easing you into the longer bits. I like his longer works better simply because they have more to say, but I wouldn't start there.
Lovecraft wrote archaically even for his own time. He had some really interesting ideas, which is why his mythos has been used as a basis by so many other authors, but he wasn't a very good writer in a technical sense. I really enjoyed his short stories as a teenager, but nowadays I prefer seeing what IMO more talented authors can do with the mythos.