Sports without controversy is boring. This is why we still rely on the human eye in Football (Soccer to those across the pond who don't play real sports) and haven't reverted to the clinical nature of automated refereeing, which is no doubt possible with technology these days.
You surely cannot seriously blame Senna for the actions of Schumacher et al? Schumacher only really came to the fore once Senna was gone and whilst I agree, that it was in his nature to push the boundaries to the absolute limit, I'm not sure I agree that he was a bona fide cheat. Schumacher however, CLEARLY moved across on Hill in 94 - a clear act of cheating having already smashed himself into the wall.
My memory is Hazy, but I seem to recall the Suzuka Showdown in 1990, when JM Balestre had "decided" that pole position was on the dusty side of the track, when co-incidentally Alain Prost was on the preferred side - Prost needed to win to have any chance of the title. Senna took Prost off at the first corner, after the lack of grip had left him in second with barely 100m of the race gone. I can't say I really saw that as cheating - other than on the part of Balestre for which, and I believe he got his commupence when Prost was shunted off.
It's a tough call really - comparing it to football again, I disliked Robbie Savage, and I still dislike Neil Warnock, Arsene Wenger, Brendan Rodgers, Welsh football teams and so on, but I also think that whatever their gamesmanship level, football would have been a poorer place without them. So for me, on that level, Senna made F1 interesting.
Danger? This is motor racing - if you don't like a bit of danger, you're watching the wrong sport.
All of this with the caveat however, that (whilst I was only 13 at the time) I also cheered when Senna crashed - but at the time, I was excited because he had become the pantomime villain to my childhood hero (who I only really saw as a helmet, instead of a person). I would have cheered initially if Robbie Savage had gone down injured, or Neil Warnock had been clattered by a flying football boot, or the whole of Swansea had been blown up - It's natural for these pantomine villains.
I am also finding myself staying awake for GP's these days, whereas before, once the start was done, it all seemed like a good opportunity for a kip before the last lap.......