No, they're cute, neurotic, complain a lot, and fall in love with the Doctor (who is a Great Man with the weight of the universe on his shoulders.) They're all Sarah Jane.

There was the one companion where both elements happened at the same time; the last primarily useful companion, the first companion to be in love with the Doctor: Jo Grant, the UNIT agent with a certificate from an "Escapeology course," but would look up at the Doctor with puppydog eyes. She had suddenly replaced Liz Shaw, the super-competent UNIT scientist who sometimes seemed like she could barely tolerate him. They made Jo Grant a rookie and a klutz.

Up to Jo Grant, the companions were primarily there to do things, so the Doctor didn't have to be everything. Jo Grant was the one who would free them when they were tied up and locked in a storeroom; like how Zoë would make fun of how bad the Doctor was at driving the Tardis. Sarah Jane, by contrast, was as helpless as a fetus, constantly complaining, and hopelessly in love.

Leela, Romana, and Adric (although Adric was constantly humiliated, then killed) were still left to come, and Ace allowed the useful companions from the original series to go out with a bang(sorry), but in Nu Doctor Who it was to be strictly Sarah Janes forever.

People even thought Donna Noble was a breath of fresh air because even though she was useless and constantly complaining, at least she wasn't constantly simpering and crying over him. The absolute nadir of this trend was when Martha Jones, actually a medical doctor(!), was nearly suicidal with lust over him and he was just not into her at all. Doesn't like career women, I guess.

It's not you, Martha, it's me. Now I'm off to haunt a little girl's bedroom and cuck the sweet, perfect boyfriend who would be willing to wait 2,000 years for her. Maybe you should look up Mickey, that other guy whose fiancé I stole while I let him ride in the backseat. He's single; I ruined his girl for anyone else.

Lost Doctor Who episodes found