Suites are specifically outside the MR upgrade scheme. If you want a suite with Marriott, you have to pay for it, or take the (very) slim chance they decide to upgrade for reasons that are utterly impenetrable.

Like Hhope, CL floor is not an issue to me. A good room with CL access, now that's important, and I am aware with at least one other scheme that CL access only accompanies a CL floor upgrade, which is never guaranteed. The fact you dont have to "luck out" with a CL upgrade to get CL access is a big ^ for the MR scheme.

Generally Marriott hotels don't have many suites, and generally Hyatt and SPG have more in each hotel, suite upgrades are an integral part of both those schemes, but then again with SPG the earn/burn ratio is worse and with Hyatt the inventory more expensive. All programs have their own strengths and weaknesses, but expecting a suite upgrade when it is specifically mandated NOT to be a part of the program is letting yourself in for disappointment.