Don’t generalise. I graduated from the topmost IIM and I have multiple friends who graduated from Tier 2 colleges. I can say they went through Courses, experiences Etc., that helped them equally in personal and professional development.
They won Case comps in which ABC students participated as well - showing that they’re no less.
Yes, opportunities differ, but you can still end up getting 20+ LPA jobs (all my friends did), which was much more than what they would earn without an MBA.
You never know how a 2 year residential program might change you (personally + professionally), so don’t generalise.