With the complaint floating around that reviewers haven't taken the time to dig into the combo system and fully understand it, it's worth taking a look at what tutorial info on combos Anthem does present to the player.
Here is the grand total of information I could find in the game about the combo system, located on a page two layers deep in the codex. Note that only the last paragraph of this page pertains directly to the combo system.
That's it. Two sentences. The game doesn't point you to this page; you'd only know to go looking for it in the first place if you paid attention to the COMBO text occasionally flying off of enemies or the few item descriptions that reference combo properties. If there's more explanatory info available somewhere else in the game, it must be in an even more obscure place than this because I haven't found it.
Look, the concept of "some abilities set up combos and other abilities trigger them" is self-evident just from playing the game -- the Storm's starting abilities do exactly that, so at least with that javelin it's hard to miss. But what if you want to explore the system in more depth? What distinguishes an impact combo from an aura combo or a chain combo? Do certain elements complement others? Do fire and ice cancel each other out? I have screenshots of three different pieces of gear that all have differently formatted flavor text about combo properties, so the messaging isn't even unified across all the loot.
You might suggest mixing and matching abilities to test out combos in free play, but for me that's a nonstarter when you have to go through five minutes of load screens into town and back every time you want to change anything about your loadout. From what I hear, if I want deeper info on this stuff I need to go... watch a developer stream from two months ago? I've seen terminology like "primer" and "detonator" thrown around, so obviously there's a more fully developed framework under the hood than what the game itself exposes, but you can't fault players (reviewer or not) for being unaware of it when even the game seems to treat combos as an afterthought.
Not to bellyache about this ad nauseam, but it's tiresome watching (an admittedly small number of) people complain that reviewers aren't doing their job in making an effort to dig into the combo mechanic because
there's nothing to dig into.