I've had three Evinrudes, a 90, 150 & 225, a 225 Yamaha and now have a 115 Merc Optimax. Didn't have any trouble with any of them except the Evinrude 225. The power pack went out twice. All three Evinrudes were cold natured and hard to start in the winter, very embarrassing at the ramp. These were all carberated engines, I'm sure the newer ones don't have this problem.
I had the Yamaha 225 for six years with no trouble and low maintance cost, loved it.
I've had the 115 optimax for one year. It is an excellent motor, very quiet running, runs great, is a fuel mizer and starts almost instantly. However to keep the warranty, which is a must, service is expensive.