I dont know how good San Diego is expected to be this year, but I'd hope the Mets could win 2 of three to start the season. Miami flat out stinks, and their only good pitcher is Nolasco, so once again the Mets should win at least 2/3. Philly is better than they were last year, and should be better than the Mets. While the Mets do play well in Philly, it is likely they lose 2/3. Then they have 7 more on the road. Ten straight road games is rough for any team. If they go 4-3 thats a good trip.
Realistically, I think a 9-7 start would be a good, and expected record. I could see them sweeping one of the teams at home, but struggling worse on the road. Either way, if they are over .500 I think they did a good job with it. If they get 10+ wins they will have started very strongly.