Pharos, but worse. A 1 discount is not even vaguely worth the cost of being useless in the early game, coming down at (up to) the same 5 strength but requiring setup time and runner cooperation, and being more expensive to boost. It's an option for decks that really want to run 6x Pharos, though, or Ob Superheavy Logistics decks after a passable 6-cost bridge between Pharos and the rest of the deck.

It does have one saving grace: Boomerang immunity. Is that enough to be favourably comparable to Pharos? ...no. Don't expect to see this one flying solo any time soon.

EDIT: it is a quick stack of advancement tokens for Red Planet Couriers. While I still don't think that makes it good, it does increase the likelihood of me specifically building some kind of hilarious jank deck that fast-advances 5/3 agendas from hand, probably playing Biotic Labor and Red Planet Couriers to score The Basalt Spire then recur the same two cards for re-use, and possibly something to derez Logjam for re-use as well. Interesting note: if you derez and rez Logjam repeatedly, the advancement counters stack. If only Government Takeover still existed...

Logjam stocks went up in the startup format with the ban of Pharos.

However, even if Pharos is present, Logjam is still good. Why is that?

First, it gets advancements for free. This synergize with Trick of Light and Hearts and Minds, which can use those advancements, without forcing the corp to first put them there.

Second, it has 3 end the run subroutines. Making it difficult for Botulus and impervious to Boomerang.

Third, on a face check, it gives back 2 to the corp, making this ice cost functionally 4.

Finally, it can have near infinite strength (helped by cards like Tree Line), contrary to Pharos, possibly making it impossible to break.

The big downside of this ice is that Hush put it at zero strength.

Art shows a log jam, in the literal sense of it. It is a bit hard to make out, because of the color saturation. It could have been a log (as in computer logs) jam also. Both work, making it a clever word play. This gives the idea of a big barrier. Ok.