If you didn't enjoy
MNSSHP, you probably will not enjoy
MVMCP. After the last party, the parade is in the park the next day for all guests to enjoy. However, I've seen numerous posts stating that they are different. MNSSHP of course has the candy stations and new party within parties.
I thoroughly enjoyed MVMCP 2014. We where there for 10D & still did the party. I felt that Christmas parade was too crowded during regular park hours, as attendance had increased closer to Christmas. Saw both parades during MVMCP and did the Wishes Dessert party during MVMCP.
I think attending parties/cost of party value is completely subjective. Also, I believe your experience is what you plan for and knowing there may be bumps in the road. I went with 7 things I wanted to do during the party and any thing extra was a plus; I had a list of my extras. Numerous posts stated the last party would be the most crowded and not worth it since parade would be in parks later. I did not base the party on the parade. I wanted to meet 7D, Sandy Claws, Princesses with their Princes, Santa Goofy, & Minnie in Peppermint Dress - WE DID. I wanted to see the parade @ night (in front of Casey's Corner), see the fire works, see the Castle Show (we were very close to castle stage) - WE DID. We also meet some other characters, took photos with PhotoPass photographers, and rode a few rides. We did not do the dance parties. We reserved the 3FP+ b/t 4-7pm. WE had dinner at CRT @ 2:30pm. Snack @ Casey's prior to parade. We enjoyed the treats at a few locations.
If it's in your budget, I would attend at least once, IMO.