Dynamics is their attempt to join the ERP, CRM market and so far it's still a niche because they're targetting mid-size to large enterprise but the larger companies typically would either go with Oracle or SAP for ERP and something else for CRM.
In some respect, it is similar to LotusNotes in which you can write little apps backed by a data structure called SharePoint List (or SharePoint Document Library). So when I saw Trello, that's like Sharepoint List. Period. Sharepoint List is the core data structure, everything else seems to be derived from it.
The biggest difference is of course SP is web-based and tightly integrated with Microsoft other products: Office, InfoPath, .NET, Dynamics, Outlook, Exchange, AD, etc.
You can pretty much do/build almost everything (specifically Line of Business type of app) with SP (let's avoid technical discussion regarding whether an implementation of Time Tracking should be backed by RDBMS or not since these days people are using NoSQL anyway).
I have to say that it's not a bad product and there are use-cases where Sharepoint can fit.
Last I heard everyone was ditching it for Dynamics or anything-else-but-Sharepoint. I've never heard a good word said about Sharepoint. Though they seemed good at selling it. But it sounds to me that it invariably turned into a disaster.
I've always regarded Sharepoint as the new Lotus Notes, I'm happy to admit being wrong as my experience with it is a little tainted as I once worked for a company that Sharepoint was often suggested as an alternative to our product.