Depends on what you're looking for, man. If you're looking for technical and creative mastery on par with the modern show, you will be disappointed every single time. If you want a good story, roll the dice. They aren't all perfect. But, some are just right. In other words, if you didn't like
Genesis of the Daleks, then who is to say you won't love
The Talons of Weng-Chiang? You might loathe
The Deadly Assassin, but find
The Horns of Nimon irresistible. Who knows? Really is up to you to decide if you want to try and get into the show's history.
Also, there have been/are Eleven Doctors to choose from. Each one brings their own flavor and chemistry to the show. Wit, humor, and a bizarre, bohemian energy? Watch Tom Baker's 4th Doctor in
The City of Death. Want a super-Doctor that effortlessly commands his surroundings, and taught David Tennant the core of his Doctor to come? Watch the 4th Doctor roll over every other character in the season-opener to
The Key to Time saga titled
The Ribos Operation. Want tension and despair where Phantom of the Opera meets intergalactic gun-running? Try Peter Davison's 5th Doctor in
The Caves of Androzani. Need something mad and mean and just too bizarrely 80's to give you a sensory-overload buzz? Walk straight into any episode of Colin Baker's 6th Doctor. Need a calculating savant with the soul of Charlie Chaplin and the devious nature of the Norse godling Loki? Sylvester McCoy's second season as the 7th Doctor. Need some 60's Adventure Team with James Bond-a-go-go? Jon Pertwee as the 3rd Doctor spends his exile on Earth with UNIT. Try
The Time Warrior.
To sum it up, Doctor Who is the ice cream shop of science fiction: if you don't find a flavor you like at first, there are still plenty of others to try...