You're building your own engine, and it's a cash grab when you boil it down; there's worker placement which allows for blocking (which isn't especially combative). Where things get interesting is in having to use other people's buildings and services, paying each other rather than the bank.
Le Havre looks to fall into the standard Euro trap of being several solo games that just happen to share a board. Is that fair, or is there significant interaction between the players?
It's not *quite* multiplayer solitaire, but if you don't like Euros then run a hundred miles. Celebrating it for what it is, not what it isn't, and it's a phenomenal game. There's so much replayability, so many different routes to success, that it'll take numerous games before you get a grasp on the majority of the ways of playing.
It's a pain in the arse to set up, but that's my only negative.