I liked them for a bit in high school, when their youth angsty stuff resonated with me hard. I find them really difficult to listen to today (I actually tried to some in like the past 5 years and quickly sought out Reanimation because all the funky music twists made it easier to overlook the youth angst of Hybrid Theory where the tone of the music itself even permeates with it).
Which I like aspects of their music, I liked how the cadence of everything went together (that's frankly probably the thing that matters most as far as my enjoyment of music, is just having an good cadence and especially when that's integrated very well with the vocals where they enhance each other), and the juxtoposition of Chester's and Shinoda's vocals and how the base music would underline the contrast between the two. But that overall tone is just unbearable to me now. I tried listening to their later albums but their general sound had started to age poorly for me and didn't evolve enough. It still had too much of that underlying angsty tone that for me I think diminished how much of the underlying themes hold true into adulthood. Frankly, I think that tonality even caused their musical talent to get overlooked (I think they were more talented than their music seemed), although I know for some that was their identity and what made them stand out so its what the appeal for many people about them was. But it seems like something that Chester couldn't let go of or move on from and was what ultimately led him, sadly, to his demise.
Which I don't think its terribly controversial to say that nu metal didn't age particularly well. Granted some people are being especially dickheads about it. That whole era of rock is a rough listen today (its not just Linkin Park, or Nu Metal that is that way). Honestly, I think music in general around that time was having an issue as there's very little that I think holds up to time.