But bear in mind that those Warp Spiders have a rule that specifically makes them S7 against tank (or low-I) enemies--meaning they also excel in the role of light anti-tank. And it's not just that they have a teleport, but also Battle Focus--not only are they better at shooting than a normal infantry squad, they're also 3-4x as fast. And they have 3+ armor, like Marines, so practically their only downsides are the 1 lower Toughness and that they don't have ATSKNF. For roughly the same cost.
I've seen a compelling argument that with Rhinos and Combat Squads, you have 3 Objective Secured scoring units there that mean opponents have to split their fire to a number of different targets--if they're running a list reliant on a few MCs or a Deathstar, or something, they won't be able to drag all those units off of objectives too easily, especially in a Maelstrom mission where you can be scoring points all game, rather than having to hold out until the very end.
...still, none of those 3 OS units are very tough.
