When I bought my current floating museum, (Yam 703 single lever control) I had to use a hefty push to get it into gear, then there was a good 15 degrees of nothing before it almost instantly went wide open the throttle followed by another 20 odd degrees of nothing. Not ideal by any stretch of the imagination.
So, I took it to bits - a gallon of petrol to dissolve the 20 year old solidified sand infested grease, relubrication and 6 new plastic shaft bushes later I have fingertip reliable effort free gearchange and instant throttle response. All out the same box that I nearly threw over the side because it was so bad. It's even better throttle response now it's mated to the Merc! (I suspect the old Yam needed a few of it's throttle mechanism bushes replaced too)
At the other end of the scale I've also used twin levers that needed herculean strength to move and had oodles of slack.
I prefer single lever for manoeverability, but that's just my personal opinion. Any system thats badly set up / maintained is going to be a pig to use. If it floats your boat, go for
Oh, and the "Suz is better / worse than XYZ make" is slightly amusing considering so far I've found Yam / Suz & Tohatsu controls using identical mechanisms inside their "OEM" boxes.....