When I joined this board, shortly after discovering the Romans Theme, I also joined a couple of Roman re-creationist boards. These are peopled by folks who actually go out in their free time and dress up in the gear, march around etc.
Now to me the Playmobil Roman Legionnaries look good, you can't look at one and not know immediately what he represents. Things get a bit wobblier with the officers, signifers etc, but with a bit of organisation, as Tim has shown, you can create a very realistic arm, and Playmobil did a very sound job.
On the re-creationists board you would not believe the moaning there about how inaccurate the Roman Playmobil figures were, wrong helmets, their armour fastened in the wrong place etc.
I went to Renaissance Fair in Texas last year - many people there were dressed in costumes that were distinctly NOT of the Renaissance.
I guess many people are very happy with whatever Playmobil produce in the Knights theme, as long as it carries a shield, wears something recognisable as armour, and wields a big weapon!