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If you liked the base game, Iceborne is totally worth it. The clutch claw mechanic is nice but particularly fun if you main Lance, the new monster's are great, the returning ones are better than ever. I still believe that MH4U is the best MH game ever, but MHWI comes as a close second, and definitely the best to start with.
As is usual for G/Ultimate games, the new rank adds enough stuff to even be worth a full game price so it's a steal.