I have had similar experiences, and I agree.
Personally, I feel that the extra variety does make the game more competitive by making monobuilds less reliable. While building a balanced list is more reliable, as expected, it is no longer a guaranteed win, which is where these gripes are coming from.
Clearly, not everyone has the same definition of competitive, but, to use M:tG parlance, anything that weeds the Spikes out of the game is going to be better for the game as a whole.