i dunno if he hated Baker i can't remember but for whatever reason Grade Hated Doctor Who with a passion to the point he did end up cancelling it and fans wanted it back, he hated the show so much he slashed the budget cause if you recall the last season which would be Season 22 had a pretty good budget than it was slashed and he cut the budget so much that it was shot on video tape, doctor who was a show that had celebs want to do the show after he brought it back in (1986) i don't think any other celebs did the show i don't think? i could be wrong but it was cause of Michael Grade. John Nathan Turner wanted to leave the show i don't remember which season and Grade would not let him people crack on Turner so much and with good reason don't get me wrong, i don't like him either but if you look at before season 23 i think when he still cared about the show Turner i mean. this is my own opinion or rather when his heart was still in it i meant to say
i have not seen all of 5th doctors era to be fair but i do like it. but the show was i think better than when he was forced to stay the show not only suffered this is my own opinion as i said, when his heart wasn't in it anymore cause Turner was told you leave the show is f... gone it's cancelled it wasn't just the budget that suffered it was everything, i haven't seen all of McCoy's era either but he was a great doctor i think. season 23-26 in short suffered cause i think his heart wasn't in it as much as it used to be. that and he wasn't very good at going after talent from my understanding when it comes to writers, i can think of one writer i don't remember who had been a fan that wrote a number of stories and he many have said was a terrible writer. but ya know when you don't have a good budget for a show like doctor who
it's hard to hire good writers for a good price and no doubt he may have been also forced to hire some writers that just the show could not afford i am guessing. i don't like John Nathan Turner either but i don't think his entire tenure was utter shit either. he did give us a lot of great stories too
John Nathan Turner was really in an impossible situation, without him Doctor Who would have been cancelled a few years earlier because he was the king of publicity and was the only person at the BBC who believed in it. However, he wanted to move on but there was no one who wanted to take over as Producer, so he stayed. When he was asked to tell Colin that the show would be back....but with a new Doctor, he did it under the proviso that he would also be able to leave. Having told Colin that he would be replaced the BBC double crossed JNT and told him he had to stay with the show.
Colin offered to stay with the show for a few more episodes, do the regeneration and then go - he spoke directly to the big BBC bosses at the time, but they refused and so he didn't film a regeneration.
The flip side of JNT though was that he cared more about the fandom and fame than the show, so would be at conventions all over the world leaving his script editors and staff to do a lot of the pre production stuff - he would also just drop ideas into scripts, telling writers that he wanted The Master involved or that he wanted to film episodes overseas (Amsterdam, Seville)leaving writers having to rework scripts at the last minute.
Eric Saward (script editor) had enough at one point, quit and write a stinging attack on JNT in Starburst magaine - it was the first time anything had been revealed about JNT's tenure as Producer of the show.
So without JNT the show wouldn't have lasted as long as it did, but had he been more interested in the show than the fandom and conventions the show may not have been in a state worthy of cancellation in the first place.