Yeah, I've seen other Tobe films... and going off that alone I'd say he didn't direct Poltergeist. Poltergeist has Spielberg's touch all over that film. And not just the dolly-in-pan-up shots or lens flares, but I mean everything from the acting style to the shot composition and choreography.
That's not to say Spielberg sat on set all day and night directing while Tobe brought him ice tea. But I believe Spielberg gave very thorough scene notes to Tobe and the DP and when it came time to edit, made sure his shots and style made the final assembly over anything else that may have been shot.