Roman Legions seem too weak

[Frostwulf]

Roman troops were hardly the end-all of infantry. In fact, they only became the tremendous fighting force we know them as under a few select generals. Most of the time their victories came from the use of sheer force, an unrelenting drive, and a nearly complete lack of care for casualties.

The Roman infantry was among the best in the world, especially by the time Marius made his changes(most likely started prior to Marius). A combination of arms,armor,training,discipline and triplex acies made them very formidable.