You can get all kinds of jobs on a WHV, depends what you're looking for though - and who is looking for someone like you!
For instance, on my Aussie WHV I did a lot of admin work - firstly a month-long contract that became 3 months for a public sector body, then (after 3 months' travelling) the remainder working for the recruitment agency that had placed me in the first role. Not very exciting and certainly not career-building, but it paid the bills. My cousin, on the other hand, picked grapes and other random produce on his Aussie WHV - boring!!
My husband, on his UK WHV, worked in several workshop/maintenance roles - all via recruitment agencies - for anything from Heathrow Airport to ICI headquarters. Oh, and a boring night-portering job at a hotel when he first landed.. Also not very exciting, but it paid more than my line of work
Some of the apparent lack of zing could be because the WHV is designed to be short - and some employers might think you're building up to a big travelling stint. I've generally found that recruitment agencies are pretty good at cutting through the rubbish though, if you have demonstrable skills and come across as willing to do the job properly.
Don't let what other people do dictate where you set your sights though, and regards your question about language - yes, that might be a factor, but your English skills (based on this one post) seem pretty good and certainly not limiting
