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.Now, compare that to Eldar, who have units who are dedicated to anti-infantry - either as Dark Reapers, or Warp Spiders with Rending S6 Assault 2 and a Teleport to get close.
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.Given the "any unit is scoring"rulesl that's available these days, the Tactical Squad, IMHO, is dead.
...still, none of those 3 OS units are very tough.