A difficult one to answer as the 3 elections gave them no real power, first was a coalition, second was a small majority, tge last one was a shrunken majority .
The 3 elections have overseen a massive financial crash not of the making, Brexit which was thier making , the disastrous May plan, which is devoid of direction ,the rise and fall of UKIP and the faltering SNP .
In the meantime the opposition staggers from one direction to another to another , ironically sacks anyone with a strong and opposite viewpoint to theirs , democracy eh .