Yeah, I can see that. Zones is really about skill. The objective doesn't move so that removes a variable. Tower Control can be won simply by one team or another having more Stingrays to use and that's not really a ton of fun. Rainmaker is essentially a Capture the Flag mode which means, once again, a mobile objective much like Tower Control. Stingrays are less effective, but the rain clouds sure are. I know I am repeating a lot of the points that
@Mar$el brought up, but that's because I am airing out the topic a bit more in my mind.
This brings me to Clam Blitz. I like Clam Blitz a lot, I won't lie. But I understand its problems in a competitive scene. Still, with a bit of work, I would say that Clam Blitz could be run for tournament potential. Some of the exploits need to be fixed, but it is a mode that requires skill in finding and holding onto your clams and teamwork in coordinating a successful push to get the clams into the enemy goal. I know this is an unpopular opinion, but it at least deserves some thought I feel.
What I'm really trying to get at is that Tower Control sucks.