You probably watched the DEEN adaptation which is widely regarded as being a piss-poor adaptation mainly because they tried to mash elements from all three routes together into a single one while adding in pretty underwhelming animation quality. If you've already read the first route of the visual novel and enjoyed it, you'll probably enjoy the other two routes and I'd recommend playing through those to get the full experience. From what I can tell though, the ufotable anime does a decent job at adapting it and of course the fight scenes are glorious.
