So - back in the day - Telekinesis was considered to be one of those powers that distinguished a "good" controllers from - those that couldn't use it lets say. Disclaimer: I didn't like it back in the day, I could use it but preferred not to - I didn't want to be a gravity controller! It was a power though and some excellent guides - like Hedon's - were written.
The game changed though over time. TK today is different (nerfed if you like). When it comes to enhancements you have the rule of 5 and diminishing returns - so simply slotting it with 6 End Reduction is not an option - and that is before you factor in the bonuses you can get from enhancement sets (no sets work with TK). Then you have Ancillary (Epic / Patron) sets which provide extra options for builds which, imo, makes fights faster thereby reducing the value of TK; their addition also meant that there are other options available. Back in the day you didn't have the flexibility.
Most telling, imo, is that whilst ATs can be slotted into sleep, fear, domination, confuse enhancement they cannot be slotted into TK. Now you could suggest this was the devs trying to dissuade people from using something that was "overpowered". The argument against that though is that its a Psychic Mastery option - so they made it available to all.
My suggestion to anyone thinking about it is … to try it. That is what respecs are for! If you like it and feel it adds value to the teams you group with go for it. If after slotting it you find you are hardly using it, or you use it and a few seconds later all the mobs are dead, or you want to slot an extra set for the bonuses pick something else.
Read the guides but recognise that they were written when the game was "different".
