Even my dog can get understood. Of course, the first things you want is understand and getting understood, but unless you have very specific missions to do, you need more (look at the military lexicons on lingnet.army.mil : hands up ! Don't move ! etc... ). You should aim for a correct syntax and a good pronunciation. If you make a lot of errors, most people will not have any pleasure talking to you and you will not instill any confidence in business partners. A fair command of the language is necessary to command respect.