Oh, I don't disagree at all. Eidos and its in-home brands aren't worth that much - Tomb Raider is mainly a nostalgia IP, Deus Ex was well-regarded but also feels kinda niche, Legacy of Kain is... both, sorta (?) and same probably also goes for Thief and it's worth keeping in mind that they also just let I.O. Interactive become independent while selling them their Hitman IP - so while the value has actually about doubled compared to what Square Enix bought them for in 2009 ($300 million compared to an initial investment of ~$165 million when accounting for inflation), it's still far below compared to what Sony paid for Bungie ($3.6 billion).
And I think that low value ties into how Square Enix never knew how to handle Eidos in the long run. Bungie was able to get the rights for Destiny 2 from ABK and that's an on-going money-maker for them, but SE never quite got there with Eidos. Yeah, apparently Avengers is "good now", but even that game despite the massive IP was just... fizzled out and is left to linger in the void, compared to SE's core IPs which have regained some traction in the last few years.
I think what helped Sega is that they had a general hand in Western publishing for years and just let the studios do their thing as opposed to the others who were more about JPN only publishers wetting their pants over the success of GTA and others and as a result tried to rush into capitalizing on Western markets. Like, Capcom is more successful now that they've gone back to doing their thing instead of desperate appeals to non-Japanese sensibilities like RE6, Bionic Commando and DmC.