Would be better if I hadn't seen Robin Hood
The Richard Greene Robin Hood series, of course, kickstarted ITV's boom in medieval swashbucklers in the '50s and '60s: but while none quite matched up to it, most managed to achieve an individual identity. Unfortunately, William Tell was just too similar. It's good adventurous fun, of course, and judged on its own it's better than, say, Sir Lancelot: but it's always going to be in Greene's shadow, which is a shame.
"An inglorious peace is better than a dishonourable war" ~ John Adams