Some boat manufacturers and brands have a reputation for good or bad quality, but this is complicated by the fact that sailboats can have different "types of quality", i.e.,
-- overall quality of design and engineering;
-- aesthetics, satisfying design, fit and finish, quality finishes, luxury touches, appearance that boosts pride of ownership;
-- suitability for intended purpose -- racing, dockside entertaining, coastal cruising, crossing oceans, etc., flexibility of design;
-- execution of the design/build quality -- quality and professionalism of installations, meeting and exceeding codes, consistent lay-up, bonding, fastening, robust connections and installations, things don't fall apart;
-- livability, conveniences, ergonomics, hand holds, crew safety/safety engineering, traffic flow for living aboard, useful sea and port berths, functional galley, "human engineering";
-- maintainability, ability to access and inspect systems, ability to replace systems without having to tear the boat apart, modular designs, use of commonly available and easily repairable systems;
-- durability, ability to survive poor conditions, ability to maintain structural integrity and keep resale value;
-- sea kindliness, comfortable ride, ease of steering in all conditions, ease of short-handed or single-handed operation.
And in the modern world, boats get built to "price points".