1999 Renault Laguna timing and valves

i have just bought one and after 2 days there was a loud rattling noise in engine,,one of the timing belt tensioners had broke,still drove 200 miles home,it drove perferct,had someone to change it and redo the timing,he reckons the valves are bent,would they all be gone as she was driving fine and how much am i looking at being as the timing belt and tensioners are already new and i wont need them,is it worth fixing?thankyou