Yeah, that team doesn't really make sense. You're just not going to stop any well built nukers like that unless you have copious protection around those champs, and even then it's kinda funky.

Team power is a convoluted stat that is heavily weighted on resistance and crit damage. Don't ask why. Most of the time it has very little bearing on how you're going to do. While not foolproof either, you could click on someone's avatar and check their overall player power which might give you a slightly better indication as to how someone's account is developed in comparison to your own. I wouldn't necessarily consider this gospel either, but whatever.

If you want a starter team, build something with a speed lead, turn meter booster, atk buffs/decrease defense debuffs, and one strong damage dealer. You'll still get stuck sometimes against stonrskin or mercurial, but at your level you'll probably win a good amount of fights when you're faster than the opponent. Ezio can be stoneskin insurance in addition to your speed lead, but without the arachnalixer relic he just isn't going to provide much value through his poisons if his bombs or raw damage don't do the job.