The "I sense" stuff can be rather hokey, & out of place. She just rarely ever delivered it in a way to make me comfortable with it. It never seemed organic. I mean it was a show of oddball presentations, when you consider Data's emotionlessness, & Worf's stifled hostility, but hers never found its groove as well as those others imho. It's why they tried more often to have her be therapeuticOdd. When I cam to rewatch TNG I realised what a good actress Marina is...she holds an accent that’s unnatural to her, makes you believe in various relationships, and always seems basically belivable. I can’t think of any instance of particularly bad acting. Your complaint seems more with writing and character as developed.
The acting is fine though.
Oddly enough though, you're right about her other stuff. She found a very comfortable niche in how she played off the other cast members, in social dynamics, & some of her own stories are not bad either. Face of the Enemy, her bits in Disaster & Thine Own Self. All in All, I always thought Crosby was a worse actress than Sirtis. Gates McFadden isn't all that much better either, tbh. You know, they're soap actors. How much can you really expect?