Well, if you look for an easy and immediate and understandable language, I suppose English could be one of the best choices. For the same reason, I'd drop PE's italian (too many exceptions to the rules to be learnt - well, it's obvious, being italian :D)
Then, if you consider that a complex language trains best our brains to analyse (or analyze, pick you favourite :P) the relationship between signifier and signified, and thus keeping our brain trained, maybe I'd drop English (the way they teach it outside England/USA, at least).
For the record, I am not stating that English speakers are less intelligent, because real English is complex (first) and because I can't quantify this effect.
Consider the case of that tribe which couldn't learn to count even with missionaries' assistance, because they had only "one", "two" and "many" as words to count, and thus couldn't undestand the difference between "six" and "nine" (and don't say "it's simple, reverse it").