vs tactics

Should the ratings one achieves in chess mentor be similar to rating one has in chess tactics ?

no

I have no idea what the expectation is, but as a data point, my rating in Chess Mentor is similar to my rating in turn-based chess, but my rating in Tactics Trainer is much, much lower.

Both formats penalize you for time, but Chess Mentor is more forgiving of those who take longer to think.  I lose a lot of points in Tactics Trainer for correct solutions that took much longer than the average time.

Then again, I lose a lot of points in Chess Mentor because my "alternative move" wasn't what the programmer had in mind, and I make a dozen incorrect attempts at guessing the programmatic solution.

I guess no matter how you slice it, I just lose a lot of points everywhere.