Simply Wall street has it listed as extremely undervalued with an intrinsic value of $1.83 based on discounted future cash flows although their earnings growth expectations are very bullish at 13.2% against a 16/17 growth of 9.6%.
Still, quite a clear back of the envelope calc that based on existing fundamentals and assuming current forecasts are hit, its ridiculously undervalued so even if there is subdued growth over the next few years post acquisition which some of the more well known analysts are pricing in to varying degrees, RXP has greater upside potential than downside risk, particularly at the current price levels.
Also from a technical viewpoint the RSI is chilling around ~25, generally a pretty good sign the sellers have gotten a bit carried away.
Agree that maybe weak buy side pressure comes down to the market waiting to see some results post acquisition, however would be very surprised if they are even remotely close to what is currently priced in.