Devil'sLair was an extremely popular resource hub for fans of the franchise, and a place that I and many fans remember fondly. Every soundtrack, wallpaper, audio drama and manga scan that many English-speaking fans take for granted now were posted in an abundance on the site, and made it one of the ideal places for a fan to get their DMC fix.
Now, as for the fandom split being one of the main causes for the end of the website's thriving existence, well...from what I remember, the fanbase had already been split from the polarizing reaction to
DMC4. As much as a debacle that
DmC has created in recent years, I still remember the mountainous hurdle of heated forum threads, where people were tearing the game apart on the sole grounds that "it simply wasn't
DMC3". You can imagine the devotion and fanaticism surrounding
DMC3 by the time
4 had been announced, and everyone's love for the game had only been basted by things like the now-legendary TrueStyle Tournaments. And after 4 failed to live up to expectations, followed by a few years of neglect leading up to
DmC, a lot of
Devil'sLair's core members ended up departing.
And whatever half of the website's userbase that still remained was shortened to even smaller nub when
DmC came about, leaving the miniscule remnant of people squabbling over minute arguments, which eventually led to Cat and some of the others to abandon the sinking ship that the site had become.
It was a sad end for what could possibly have been the haven for
DMC fans, but given how the site's mutation into a festering, half-empty shell of what it used to be, one could argue that it was a necessary death.
I remember too a lot of "fans" insulted Cat because they didn't like her Anime's subtitles, (which by the way were more accurate than the dubbed official version, where some of the episodes go astray of their original script)
As someone who watched the development and fan hype build around the anime's release in the States, I can 100% vouch for this. People blasted Cat with such needless hostility, because she did away with some of the Dub's forced jokes and dumbass puns to stick to the original script. Even someone like me, who didn't care for the anime in ANY form, appreciated the efforts she went to deliver an accurate translation---but everybody was too caught up with "the superioriety of the dub" to give a damn.