Are the new maps really bad..? I haven't bought them yet but I've been thinking about it. Probably just going to wait for the new map pack and then buy both of them.
If you're going to buy all 3, you'd save money by getting the season pass. Buying the first two individually will cost 1600 MSP. The season pass is 2000 MSP. So if you buy the two, and only those two, then you'll be better off. However, if you buy those two and then end up liking what you see for the last set, then you'll have spent 400 MSP extra (800 each x 3 map packs).
Just something to think about before impulse buying the two map packs. Frankly, the first map pack was meh. If the 2nd and third are good, though, you could save money by buying the last two and just ignoring the first one.