Regarding speed, spin and control, there could be very different understandings, like:
- speed in itself does not tell too much, just some mere average
- the speed with gears makes more sense, as should help identify bouncy rubbers (high speed, but less gears - poor close game, but less physical effort needed to return balls in general) vs. dynamic rubbers (medium-high speed and many gears - very precise short game, but sometimes much more physical reuirement)
- spin is again like an average, without mentioning how much spin could you make with the topsheet alone, or with the sponge
- spin with tackiness tells more about the topsheet's ability to spin the ball
- tackiness should be separated to tackiness and grippiness
- grippiness tells if you push the ball to the rubber topsheet, how much is the friction
- tackiness refers to the rubber material being tacky (sticky to the touch, ability to lift the ball) - many rubbers with tackiness values around 1-3 on revspin are not tacky at all, just grip the ball very well, when pushed against - also, I know a few rubbers, which are somewhat tacky, but less grippy than others (sounds controversial, but it is real)
- spin with throw angle tells more about the amount of spin achieved vs. the perceived speed on average (throw angle should be evaluated for different power inputs - when adding more power and getting higher throw angle, it means, that the sponge greatly supports generating spin)
- and there it is... CONTROL - I think, this is where the perception is the most divergent between players with different experience and skill levels - so this only relevant, if I'd say, there are at least 50 ratings, and then it is still just less than half-information
- furthermore, there is sponge hardness - topsheet firmness should be also rated, as it also greatly influences, how a given rubber can be interacted with
To get to a point, where one could have some kind of understanding, the only way is through carefully planned purchases of different kinds of equipment - for these, the most help is the detailed reviews, where players of different levels share their thoughts, how that given piece of equipment behaves in different game situations, or what was their expectations of quality regarding that product, and to what extent were those met when actually had it. Sometimes it can be interesting to see more expensive stuff, but while it is for exploration, cost-effective stuff tell more about the characteristics in most cases.
(Just a side note: After a few iterations with a few blades/rubbers from TT11, I made a deep dive into AliExpress, and I already found a lot of favourite items, and of course, not-so-favourite items as well. For somebody thinking about pips-out rubbers, Chinese manufacturers can give a few good examples, so one may skip the pricier German-manufactured pips-out rubbers.)